Posted by **katie** on Friday, May 23, 2014 at 4:18pm.

A rock tumbles straight down from a cliff, its moving at 20 m/s when it hits. What is the height of the cliff? The mass of the rock is 8 kg.

a) 2.5 m

b) 400 m

C) 20.4 m

d) 160 m

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