A Toy Rocket Is Launched Vertically from Ground Level at Time

A toy rocket is launched vertically from ground level at time t = 0 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 49.0 m and acquired an upward velocity of $60.0 \mathrm {~m} / \mathrm { s }$ The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The maximum height reached by the rocket is closest to

A) 233 m.
B) 221 m.
C) 209 m.
D) 244 m.
E) 256 m.

Correct Answer:

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