brooklynzen52 brooklynzen52

08-02-2018
Physics

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A 8.00 kg rock falls from a height of 20.0 meters. Determine the momentum of the rock right before it hits the ground. (4 points)

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shariquekhan25ow696t shariquekhan25ow696t

08-02-2018

by energy conservation you can obtain the velocity as the potential energy will be converted into the kinetic energy
1/2mv^2 = mgh
v^2 = 2gh
v^2 = 2*10*20
V = 20 m/s
thus momentum is equal to mv = 8*20 = 160 kgm/s

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good job