Aller: A balloon is ascending at the rate of 10m/s
when it is at the height of 1000 m, it dropped
the food packet. when & with what velocity
will it come to Earth?
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Applying law of conservation of energy
mgh=0.5mv²
2gh = v²
2x1000x10= v²
v ~ 140 ms-¹
t² = 2h/g
t = 2x1000 /10
t = 14 s
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