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Freefall & Motion

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Question

from a balloon rising vertically upwards at 5m/s, a stone thrown up at 10m/s relative to the balloon. Its velocityvwith respect to groung after 2sec is?

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Solution

Speed of balloon w.r.t ground=5 m/s (Upwards)
Speed of stone w.r.t balloon=10 m/s
So, speed of stone w.r.t ground=10 +5=15 m/s
u=15 m/s (upwards)
Using relation
v=u+gt
=15-10 x 2=-5
Thus the velocity of stone is 5 m/s (downwards) w.r.r to ground after 2 second.

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