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A rock falls off a cliff and hits the ground after three seconds. The rock's velocity is 29.4 m/s when it hits the ground. What is its acceleration of the rock in the downward direction?

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Answer:

formula for acceleration= (final velocity - starting velocity)/ time elapsed

if the starting velocity was 0 m/s

if the final velocity is 29.4 m/s

time elapsed is 3 seconds

then a =(29.4-0)/3

=9.8 m/s^2

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