7. A tennis ball is thrown vertically upward with an initial speed of 14.4 m/s. Neglect air resistance. How much time does it take the ball to return back to the starting point?
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- 6. A crazy, young boy on a sled is able to get up to an incredible speed of 22.5 m/s (yes, he is wearing a helmet!) along a frictionless horizontal surface while he approaches an icy hill with a vertical height of 11 m, as shown. He makes it to the top, and then flies off horizontally from the ledge of the hill. How far from the base of the hill does the boy land? 225 mis Figure 1A soccer ball is kicked from the ground with an initial speed of 18.9 m/s at an upward angle of 48.1. A player 48.4 m away in the direction of the kick starts running to meet the ball at that instant. What must be his average speed if he is to meet the ball just before it hits the ground? Neglect air resistance.Use g-9.81 m/s². Number 4.32 Unit m/sA man drives a motorcycle off a horizontal roof to a neighboring rooftop to another building. The second roof is 6 meters lower and 10 meters away. Ignoring air resistance, how long is the motorcycle in the air? What is the minimum initial speed needed to reach the other building? What direction is the man's velocity point relative to the horizontal roof just before he lands? Assume initial speed found in earlier answer.
- 6.5. You wake up in a strange room, with opaque walls, and no visible doors or windows. though there is a window on the floor, and you can see that you're in a rocket that has just taken off from the surface of an alien planet. By taking careful measurements out that window you determine that the rocket is accelerating upward at 5.31 m/s^2. When you drop a ball from a height of 2.27 m, it hits the floor 0.290 s later. What is the value of g for the alien world below you? 48.7 m/s^2 63.8 m/s^2 56.3 m/s^2 82.8 m/s^2An object is thrown vertically upwards with an initial velocity of +5 m/s and then comes back down. What is the final velocity when it returns to its initial height? Ignore air resistance.
- A diver runs off a platform with an initial horizontal velocity of 1.16 m/s in the positive x-direction. The platform is at a vertical height of 8.90 m above the water. How much time is the diver in the air before he strikes the water? O 1.77 s O 1.83 s O 3.21 s O 2.49 s O 1.35 s O 2.99 sA juggler performs in a room whose ceiling is 4.62 m above the level of his hands. He throws a ball upward with an upward speed of v 0 so that it just reaches the ceiling. At the instant when the first ball is at ceiling, the juggler throws a second ball upward with 4v 0 /3 velocity. At what distance above the juggler’s hand do they pass each other?9: An archer fires an arrow straight up into the air with a speed v0=35.6m/s. Neglect air resistance. a. Find the maximum height, hℎ, in meters, reached by the arrow. b. In terms of known quantities, write an expression for the time the arrow is in the air until it returns to launch height.
- 19. A rocket is sitting on the launch pad. The engines ignite, and therocket begins to rise straight upward, picking up speed as it goes. Atabout 1000 m above the ground the engines shut down, but the rocketcontinues straight upward, losing speed as it goes. It reaches the top ofits fl ight path and then falls back to earth. Ignoring air resistance, decide which one of the following statements is true. (a) All of the rocket’smotion, from the moment the engines ignite until just before the rocketlands, is free-fall. (b) Only part of the rocket’s motion, from just after theengines shut down until just before it lands, is free-fall. (c) Only the rocket’s motion while the engines are fi ring is free-fall. (d) Only the rocket’smotion from the top of its fl ight path until just before landing is free-fall.(e) Only part of the rocket’s motion, from just after the engines shut downuntil it reaches the top of its fl ight path, is free-fall.A ball is thrown straight up with initial speed 15.0 m/s and rises 11.5 m above the release point before returning to Earth. What initial velocity is required to make the ball rise twice as high? Ignore any effects due to air resistance.4. A daring swimmer drives off a cliff with a running horizontal leap, as shown in the figure. What must her minimum speed be as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is 1.75 m wide and 9.00 m below the top of the cliff?