A child drops a rock off of a cliff. The rock falls for 15.0 s before hitting the ground. The acceleration due to gravity is g = 9.80 m/s2. What was the velocity of the rock the instant before it hit the ground?
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v=u+at
u=0
a=9.8
t=15
v=147m/s^2
u=0
a=9.8
t=15
v=147m/s^2
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