A Toy Rocket Is Launched Vertically from Ground Level

Multiple Choice

A toy rocket is launched vertically from ground level ,at time .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 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.