A toy rocket is launched vertically from ground level (y = 0.00 m), at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 72 m and acquired a velocity of 30 m/s. The rocket continues to rise in unpowered flight, reaches maximum height, and falls back to the ground with negligible air resistance. The speed of the rocket upon impact on the ground is closest to
A) 48 m/s
B) 44 m/s
C) 39 m/s
D) 54 m/s
E) 59 m/s

Question

Quizplus · Accepted Answer

The correct answer is A.The rocket's velocity at the instant of engine burnout is 30 m/s. The rocket continues to rise in unpowered flight, reaching a maximum height where its velocity is zero. The rocket then falls back to the ground, and its velocity upon impact is equal to the velocity it had at the instant of engine burnout, which is 30 m/s.

A Toy Rocket Is Launched Vertically from Ground Level (Y