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.
19. A rocket is sitting on the launch pad. The engines ignite, and the
rocket begins to rise straight upward, picking up speed as it goes. At
about 1000 m above the ground the engines shut down, but the rocket
continues straight upward, losing speed as it goes. It reaches the top of
its 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’s
motion, from the moment the engines ignite until just before the rocket
lands, is free-fall. (b) Only part of the rocket’s motion, from just after the
engines 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’s
motion 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 down
until it reaches the top of its fl ight path, is free-fall.
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