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A person sitting in the ground floor of a building notices through window of height 1.5 m a ball dropped from roof of building crosses window in 0.1s what is velocity of ball when it is at the tomost point of window

A

`14.5" m/s"`

B

4.5" m/s"

C

`20" m/s"`

D

`15.5" m/s"`

Text Solution

Verified by Experts

The correct Answer is:
A
From equation of motion
`S = ut+(1)/(2)at^(2)`
here S = 1.5 m t = 0.1 s
1.5 = u(0.1)+ `(1)/(2)` (10)(0.1)(0.1)
implies u = 14.5 "m/s"
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Knowledge Check

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