a stone is dropped from a plane at height of 78.4 meters. what time it will take to fall on the earth and with what velocity it will strike the ground?
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Velocity , V^2=2×g×7840 cgs unit
V=(15366400)^(1÷2)
V=3920 cm/s
time , T=V/g=3920÷980=4s
while striking the ground
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