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Question

# A stone of mass 2 kg is dropped from a height 40 meter. Calculate the speed when it hits the ground.Assume a constant air resistance force 20 N act on it.8 m/s12 m/s16 m/s0 m/s10 m/s

A
10 m/s
B
12 m/s
C
16 m/s
D
0 m/s
E
8 m/s
Solution
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#### Given : h=40 m m=2kgu=0m/sForce due to air resistance f=20NAcceleration of the stone a=g−fm=10−202=0 m/s2Using v2−u2=2aS∴ v2−0=2(0)×40 ⟹v=0m/s

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