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- A skier leaves the end of a horizontal ski jump at 22.0 m/s and falls through a vertical distance of 3.20 m before landing. Neglecting air resistance, (a) how long does it take the skier to reach the ground? (b) How far horizontally docs the skier travel in the air before landing? (Sec Section 3.4.)2. A stone is thrown vertically upward with an initial velocity of 10m/s in a diving cliff 22m above the water level. Determine the velocity of the stone as it hits the water. a. 23.0573m/s b. 24.7006m/s c. 24.3002m/s d. 25.0946m/s2. A water bottle rocket is blasted up with an initial velocity of 40. m/s. Assume no air resistance. a. Calculate the maximum height of the rocket.
- My Courses Log ou 14. Jun throws a stone straight upward alongside a tree with an initial velocity of 32 ft/sec. The stone rises until it is even with the top of the tree and then falls back to the ground. How tall is the tree? A. 16 ft В. 20 ft C. 32 ft D. 64 ft 15. Which of the following statements is/are false? I. A particle moves to the right of the origin when its velocity is positive. II. A particle is not moving when its acceleration is zero. III. A particle's speed is decreasing when its velocity and acceleration have opposite directions. A. I only B. II only C. II and III D. I and III 16. A dynamite blast blows a heavy rock straight up with a launch velocity of 160 ft/sec. It reaches a height of s=16ot -16t2 aftert sec. How high does the rock go? A. 350 ft В. 400 ft C. 450 ft D. 475 ft2. A ball is launched at ground level and sent toward a wall 30 m away with a speed of 35 m/s at 40° above the horizontal. a. Calculate the time for ball to strike wall. b. At what height does the ball strike the wall? c. Find the speed of the ball at impact.A small rocket launched straight up. When at a height of 5.0km and velocity of 200.0 m/s, it is releases its booster and enters free fall. Neglecting air friction, 1. what is the velocity of the rocket at a height of 6.0km on its way up? A. 142 m/s B. 200 m/s C. 244 m/s D. 397 m/s 2. What is the maximum height, above the ground, the rocket attains? A. 2020m B. 5000m C. 7040m 3. Calculate the total time of flight between releasing its boosters and falling back and hitting the ground? A. 20.4a B. 40.8s C. 37.9s D. 58.3s
- 2. A ball is thrown horizontally from a height of 1 m and lands 5 m away. a. What is the time of flight of the ball? b. What is the initial velocity of the ball?4. There are two frogs named Eroggy and Jumpy. They jumped from the top of a vertical cliff. Froggy just drops and reaches the ground in 3.50 s, while Jumpy jumps horizontally ((bida bida siya, char! Hahall with an initial speed 95 cm/s. a. How far from the base of the cliff will Jumpy hit the ground? b. How high is the vertical cliff? c. If Jumpy jumps with an angle of 30 degrees with respect to the horizontal, what should be its initial velocity for it to land on the same spot as he did when he jumped horizontally?A ball is dropped from a build of height 72 meters. At the same time, another ball is thrown vertically up from the ground with a velocity vo. They meet each other in the middle. What is the speed vo of the ball thrown vertically up? Ignore air resistance. O A. Vo = 37.6 m/s O B. Do = 9.80 m/s O.00 = 26.6 m/s O D. Vo = 19.6 m/s D E. Vo = 18.8 m/s
- 4. There are two frogs named Eroggy, and Jumpy. They jumped from the top of a vertical cliff. Froggy just drops and reaches the ground in 3.50 s, while Jumpy jumps horizontally ((bida bida siya, char! Hahal) with an initial speed 95 cm/s. a. How far from the base of the cliff will Jumpy hit the ground? b. How high is the vertical cliff? c. If Jumpy jumps with an angle of 30 degrees with respect to the horizontal, what should be its initial velocity for it to land on the same spot as he did when he jumped horizontally?9. A driver, accelerating too quickly on a horizontal bridge, skids, crashes through the bridge railing an lands in the river 20.0 m below. The police find that the car is (horizontally) 53.6 m from the bridge. a. Determine the speed of the car before crashing through the barrier b. Do you think that this is an overestimate or underestimate, explain. Answers2. 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.