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 90 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) 61 m/s2
b) 59 m/s2
c) 58 m/s2
d) 63 m/s2
e) 56 m/s2
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