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A man in a balloon rising with constant velocity of 6 m/s propels a ball upwards with a velocity of 9 m/s, relative to the balloon. After what time interval will be the bal return to the balloon g-=9.8 m/s?
Speed of balloon w.r.t ground=6 m/s (Upwards)Speed of stone w.r.t balloon=9 m/sSo, speed of stone w.r.t ground=6 +9=15 m/su=15 m/s (upwards)Using relationv=u+gt=15-10 x t = 0 t = 15/10 = 1.5 sec
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