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Q.

How long does it take a brick to reach the ground if dropped from a height of 65 m? What will be its velocity just before it reaches the ground ? 

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a

2s, 10m/s

b

3.64s, 35.67m/s

c

5s, 20m/s

d

12s, 120m/s

answer is B.

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Detailed Solution

Time of flight for a freely falling body is 

t=2hg=2×659.8⇒t=3.64s

Velocity when it reaches ground will be

v=2gh=2×9.8×65

v = 35.67m/s

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