A ballon which is ascending at the rate of the 12m/s is 30.4 meter above the ground when stone is drooped. In what time the will reach the ground.[Ans-4 sec]
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Answer:
0= (12)^2–2gh( h is the height the stone will rise before start of fall.)
144/20 = h= 7.2m
0=12-gt
t = 12/10sec ( time to rise above 30.4m.).
Total height to fall 30.4+7.2,=37.6 m.
H= 1/2 gt^2( H. is37.6m)
37.6×2/10= t^2
t=✓ 7.52
Total time= 1.2+✓7.52sec.
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