car is traveling at a constant velocity of 60 km/h for 4 hours. Choose the correct statement about the acceleration of this car. A. The acceleration of this car is zero. B. The acceleration of this car is positive. C. The acceleration of this car is negative. D. The acceleration of this car is 15 m/s.

1. Consider a car that initially travels in the positive direction at a speed of 30 m/s. The car uniformly speeds up to 40 m/s in a time of 5 s. Find the following: a. The acceleration of the car. b. The distance traveled over the entire 5.0 seconds. C. The distance traveled during the 2 s interval where the clock goes from t = 2 s, to t= 4 s. (Assume the 5 s time interval begins with the time = 0s.)

5. Draw a distance vs. time graph for Melinda’s journey. Her home is located at 0 meters.Melinda is riding her bike over to her friend Sara’s house to complete an assignment. Her friend lives 5 km away. She accelerates away from her home for250 m in the next 2.5 minutes. She then rides at a constant speed of 300 m/min for 15 minutes. Melinda sees Sara’s house approaching so she slows downuntil she reaches her destination in the next 2.5 minutes. She stays at Sara’s house for 30 minutes while they work on the assignment. It is time to go home,Melinda rides home at a steady speed of 250 m/min for 10 minutes. Melinda is getting tired so she slows down for 250 m during the next 5 minutes thenstops for 2.5 minutes to have a drink. Realizing it’s getting late, she had to speed up 1 km in the next 5 minutes then rides at a constant speed of 300 m/minfor 2.5 minutes. Almost home, she decelerates for the next 10 minutes until she reaches her house.

13. A boy walks 155 m at a speed of 3.5 m/s and then runs for 100 m at 8.2 m/s along a straight line. Calculate his average velocity. 14.A boat can accelerate from 2 to 21 km/h in 10 s. How far has the boat travelled in this time?

An object moves in one dimension, and its velocity versus time is shown in the graph. Express your answers in m/s2. A. What is the average acceleration between the times 0 s and 20 s?  B. What is the average acceleration between the times 20 s and 50 s?  C. What is the average acceleration between the times 50 s and 70 s?  D. What is the average acceleration between the times 0 s and 100 s?

1. The acceleration of a car is given by a(t) = A – Bt + Ct² , where A = 1.0 m/s², B = 0.5 m/s³, C = 2.0 m/s“. The car is at rest at the origin at time t= 0. Find its position and velocity as a function of time. b. Sketch its position, velocity, and acceleration. a.

a. Draw the velocity graphs of Vy and Vx as a function of time. b.Draw x and y component of the position as a function of time. c. how long does it take for the rock to hit the ground? d. what is distance X where the rock hits the ground from the base of the vertical cliff?

2. A jet plane has a takeoff speed of vtakeoff = 73 m/s and can move along the runway at an average acceleration of 2.4 m/s2. The runway is 1.2 km. Write out the 3 Kinetic equations. a. b. Write out the values of initial position, initial velocity, and acceleration. How many seconds will it take for the plane to reach takeoff speed? с. d. How far will the plane have to travel to get to takeoff speed? will the plane be able to get to take off before it gets to the end of the runway? е.

4. What was the initial velocity of an object that moved 100 m in 5.60 s reaching a final velocity of 15.0 m/s in that time? Was the object speeding up or slowing down? 5. A car traveling at 40 km/h accelerates at 2.3 m/s² for 2.7 s. How far has it traveled in that time? What is its final velocity?

One of the most difficult things to learn in physics is that our everyday language is not always precise enough. For instance, we might say a car is “slowing down”, but that only gives us information abouts velocity, not its acceleration. What can we say about the velocity of a car which has negative acceleration in the x-direction? a. It is slowing down. b. The x-component of its velocity is decreasing. c. The x-component of its velocity is negative. d. It is speeding up. e. The x-component of its velocity is positive. f. The x-component of its velocity is increasing.