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Question

A stone is dropped from a height of 20 m. How long will it take to reach the ground? (g=10m/s2 ).

A
2 s
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B
0.5 s
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C
4 s
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D
1 s
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Solution

The correct option is A 2 s
Given,
u=0m/s
g=10m/s2
h=20m

3rd equation of motion,
2gh=v2u2
2×10×20=v202
v2=400
v=20m/s

1st equation of motion,
v=u+gt
20=0+10t
t=2010=2sec
The correct option is A.

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