1.

A rock is dropped off a cliff and strikes the ground with an impact velocity of 30 m//s. How high was the cliff ?

Answer»

15m
20m
30m
45 m

Solution :USE BIG Five #5 with `v_(0)=0` (calling down the positive DIRECTION).
`v^(2)= v_(0)^(2)+2aDelta s = 2a DELTA s implies Delta s = (v^(2))/(2 a)=(v^(2))/(2g)=((30 m//s)^(2))/(2(10 m//s^(2)))=45 m`


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