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Q.

A truck is moving with a velocity of 10 m/s. A person on the truck, projects a ball vertically upward with a velocity of 10 m/s. When the person catches the ball again, the truck covers a distance g=10  m/s2

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a

50 m

b

30 m

c

40 m

d

20 m

answer is D.

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Detailed Solution

(4)T = Time of flight of the ball = 2  × 1010  sec=2  sec.∴   Distance covered by the truck in 2 sec = 10 x 2 m = 20 m.
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