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Q.

From a balloon rising vertically upwards at 5 m/s a stone is thrown up at 10 m/s relative to the balloon. Its velocity with respect to ground after 2 s is (assume g = 10 m/s2)

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a

5 m/s

b

20 m/s

c

0

d

10 m/s

answer is D.

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Detailed Solution

Initial velocity of balloon with respect to ground

v =10 + 5 =15 m/s upward

After 2 s its velocity v = u – gt

=15 -10x2 = -5 m/s

= 5 m/s (downward)

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From a balloon rising vertically upwards at 5 m/s a stone is thrown up at 10 m/s relative to the balloon. Its velocity with respect to ground after 2 s is (assume g = 10 m/s2)