A Toy Rocket Is Launched Vertically from Ground Level (Y

Multiple Choice

A toy rocket is launched vertically from ground level (y = 0 m) ,at time t = 0.0 s.The rocket engine provides constant upward acceleration during the burn phase.At the instant of engine burnout,the rocket has risen to 81 m and acquired a velocity of 40 m/s.The rocket continues to rise in unpowered flight,reaches maximum height,and falls back to the ground.The upward acceleration of the rocket during the burn phase is closest to:

A) 9.9 m/s²
B) 9.6 m/s²
C) 9.3 m/s²
D) 9.0 m/s²
E) 8.7 m/s²