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Question

A body dropped from the top of a tower covers a distance 7x in the last second of its journey where x is the distance covered in first second. How much time does it take to reach the ground (Take g=10 m/s2)?


A
3 s
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B
4 s
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C
5 s
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D
6 s
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Solution

The correct option is B 4 s
In first second, distance travelled x=12×g×t2=5 m
(for g=10 m/s2)
Distance travelled in last second =7x=35 m
We know that Sn=u+12a(2n1)
or 35=0+102×(2n1)
n=4
t=4 s

Physics

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