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Q.

An object falls from a bridge that is 45 m 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 ? (g = 10 ms^-2)

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a

2 m/s

b

3 m/s

c

5 m/s

d

4 m/s

answer is D.

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Detailed Solution

Boat has covered 12 m in the same time as taken by ball A to fall down, t = 12/v

Time taken by A

⇒45 = 1/2gt²

t = $\sqrt{90 / g}$ = 3sec

Now, 12/v = 3

⇒v = 4 m/s

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An object falls from a bridge that is 45 m 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 ? (g = 10 ms-2)