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A 12kg rock falls from rest off a cliff and hits the ground in 1.5 seconds. a. Ignoring air resistance, what is the rock's velocity

A 12kg rock falls from rest off a cliff and hits the ground in 1.5 seconds. a. Ignoring air resistance, what is the rock's velocity just before it hits the ground? b. What is the rock's weight after it hits the ground? please explain every step and how you get the answers in detail. thank you

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