Question

21.A rock falls from a cliff that is 320 m highHow long will it take the rock to reach the ground? Select one:

Answer 1

Answer:

8sec

Explanation:

Use second equation of motion=

S=U×T+1/2×A×T²

V=Final velocity=0

A=g=10/9.8m/sec²

S=Distance=320m

T=?

320m=1/2×10×t²

t²=64

t=8sec

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