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A balloon is rising up at 20m/s and a stone is released from it when it was at a height of 100m above the ground. Find the time after which the stone will reach the ground.

A balloon is rising up at 20m/s and a stone is released from it when it was at a height of 100m above the ground. Find the time after which the stone will reach the ground.

Grade:12th pass

1 Answers

downey zer
73 Points
6 years ago
since the balloon is rising up and the stone is in the balloon initially
therefore the initial velocity of the stone =20m/s
now use s=ut+0.5at2 
if the up direction is taken as  positive 
s= -100m , u=20m/s and g= -10m/s or -9.8m/s (whatever u use)
just plug in the values and u will get the answer

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