A rocket is sitting on the launch pad. The engines ignite, and the rocket begins

Question

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 flight path and then falls back to earth. Ignoring air resistance, decide which one of the following statements is not false.

a. All of the rocket's motion, from the moment the engines ignite until just before the rocket lands, is free-fall.
b. Only the rocket's motion while the engines are firing is free-fall.
c. Only part of the rocket's motion, from just after the engines shut down until just before it lands, is free-fall.
d. Only part of the rocket's motion, from just after the engines shut down until it reaches the top of its flight path, is free-fall.

Explanation / Answer

Free fall means motion under the influence of gravity. so here when rocket shut down it engine it's acceleration is only due to gravity so

c. Only part of the rocket's motion, from just after the engines shut down until just before it lands, is free-fall.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.