You are driving a car along a straight road at 123 kph. Suddenly, you saw a cat crossing the road and you apply the brakes decelerating the car at a constant rate of -44.5 m/s2. If your reaction time is 1.50 seconds, what is the shortest stopping distance from the moment you see the cat? Illustrate the problem.
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- Car B is traveling a distance d ahead of car A. Both cars are traveling at 60 ft/s when the driver of B suddenly applies the brakes, causing his car to decelerate at 12 ft/s . It takes the driver of car A 0.75 s to react (this is the normal reaction time for drivers). When he applies his brakes, he decelerates at 14 ft/s? Part A - (Figure 1) Determine the minimum distance d between the cars so as to avoid a collision. Express your answer to three significant figures and include the appropriate units. HẢ ? Value UnitsQI/ A car travelling at a constant velocity of 30 km/hr , see a man walking across the road (32m) ahead .The driver reaction time is 0.2 sec. , and the brakes are capable of production a deceleration of 1.2 m/sec² ,Calculate the distance from where the car stops to where the man crossing.A car was travelling at a speed of 50 mph (mi/hr). The driver saw a road block 80 meters ahead and stepped on the brake causing the car to decelerate uniformly at 10 m/s2. Find the distance (in m) from the roadblock to the point where the car stopped. Assume perception reaction time is 2 seconds.
- 1. Travelling with an initial speed of 70km/hr, a car accelerates at 600 km/h? along a straight road. How long will it take to reach a speed of 120 km/h? Also, through what distance does the car travel during this time? 2. A ball is thrown vertically into the air at 120 fps. After 3 sec, another ball is thrown vertically. What initial velocity must the second ball have to pass the first ball at 100 ft from the ground?The driver of a vehicle sees an object on a level road 150m in front of them and takes evasive action to stop. The vehicle is traveling at 110 kph. The reaction time for the driver is two seconds and the coefficient of longitudinal deceleration is 0.41. Calculate the speed the vehicle be travelling at when they strike the object. Your answer should be rounded up to the nearest km/hr and gravity should be taken as 9.81m/s2.What role does reaction time play in applying the brakes to your car in emergency situations? Assume your car is traveling at 100 kph when a pedestrian suddenly crosses the street in front of your car. How far will your car travel before you can apply the brakes? Show your solution.What is the likelihood of running over the pedestrian? (Assume that you can bring the car to a stop in 10 m once you step on the brakes when you are driving at 50 kph.)
- In traveling a distance of 4.2 km between points A and D, a car is driven at 104 km/h from A to B for t seconds and 42 km/h from C to D also for t seconds. If the brakes are applied for 4.3 seconds between B and C to give the car a uniform deceleration, calculate t and the distances between A and B. A Answers: t = S= 104 km/h 101.9262821 i 2.9 B T C T 4.2 km 42 km/h S km4. From a speed of 75 kph, a car decelerates at the rate of 500 m/min? along a straight path. a. How far in meters, will it travel in 45 seconds? b. What is the car's velocity after 45 seconds?An engineering student is driving on a level roadway and sees a construction sign 600 feet ahead in the middle of the roadway. The student strikes the sign at 35 mph. If the student was travelling at 55 mph when the sign was first spotted, what was the student's associated perception-reaction time, in seconds? Assume that deceleration is 11.2 ft/s2 A. 9.81 B. 5.29 C. 8.91D. 2.59
- While travelling at a constant speed a driver saw a road block 112 m away. He applied the brakes and the car decelerated uniformly at 6.4 m/s^2. It stopped 5 m from the block. Find the initial constant speed of the vehicles in kph, if the drivers perception reaction is 2.2 second. a. 91.86 b. 26.31 c. 25.52 d. 94.722/98 A car is traveling around a circular track of 800-ft radius. If the magnitude of its total acceleration is 10 ft/sec² at the instant when its speed is 45 mi/hr, determine the rate at which the car is changing its speed.Problem 2 A project by some to monitor the traffc safety at a busy intersection. They measwre (with a precision stopwatch) that exactly three seconds after car B passes through the intersection traveling south at vg = 55 mph, minivan A passes through at va = 70 mph on the road that runs at an angle 0 = 60° east of north. The speed of each automobile is Civil Engineering students requires them constant. Determine (a) the relative velocity (in mph) of B with respect to A, draw the vector triangles as part of your answer (b) the change in position (in fi) of B with respect to A during a 10-s interval, (c) the distance (in ft) between the two automobiles 3 s after A has passed through the intersection.