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

Question

Quizplus · Accepted Answer

Using the kinematic equation $ v^2 = u^2 + 2as $, where $ v = 40 \, \text{m/s} $, $ u = 0 \, \text{m/s} $, and $ s = 81 \, \text{m} $, we solve for $ a $ to find the acceleration during the burn phase.

A Toy Rocket Is Launched Vertically from Ground Level (Y