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Q.

An object falls from a bridge that is 45m above the water. It falls directly into a small row-boat moving with constant velocity that was 12m from the point of impact when the object was released. What was the speed of the boat?

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a

1 m/s

b

2 m/s

c

3 m/s

d

4 m/s

answer is D.

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Detailed Solution

Boat velocity  v=st⇒t=sv=12vs........(i) In the same time the ball has to reach the boat∴t=2hg=2×4510=9=3s∴ From (i)v=st=123=4m/s
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