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 64 m and acquired a velocity of 60 m/s.The rocket continues to rise in unpowered flight,reaches maximum height,and falls back to the ground.The time interval,during which the rocket engine provides upward acceleration,is closest to:

A) 2.1 s
B) 2.3 s
C) 1.9 s
D) 1.7 s
E) 1.5 s