A packet dropped from a helicopter reaches the water level of a river in 7.5 s and then travel for 4 m within the water, before coming to rest calculate(1)the height of helicopter above the level of river (2) final velocity of packet before hitting water 3) retardation offered by water. g= 10 m/s square
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s= ut + 1/2 gT²
s=0*T + 1/2 10* 7.5²
s=282.2
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