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Question

A man in a balloon, throws a stone downwards with a speed of 5 m/s with respect to the balloon. The balloon is moving upwards with a constant acceleration of 5 m/s2. Then velocity of the stone relative to the man after 2 seconds is:

A
10 m/s
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B
30 m/s
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C
15 m/s
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D
35 m/s
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Solution

The correct option is D 35 m/s
In a frame relative to balloon,
uSB=5 m/sec(^j)
aSB=15 m/sec2(^j)
v=u+at
v=515×2(^j)=35 m/sec(^j)
|v|=35 m/s

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