1.

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

Answer»

We have given: 

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.t to ground after 2 second.



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