A 1.14 3 104 -kg lunar landing craft is about to touch
Chapter , Problem 101(choose chapter or problem)
A 1.14 3 104 -kg lunar landing craft is about to touch down on the surface of the moon, where the acceleration due to gravity is 1.60 m/s2 . At an altitude of 165 m the crafts downward velocity is 18.0 m/s. To slow down the craft, a retrorocket is fi ring to provide an upward thrust. Assuming the descent is vertical, fi nd the magnitude of the thrust needed to reduce the velocity to zero at the instant when the craft touches the lunar surface.
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