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.
A
8 m/s
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B
10 m/s
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C
12 m/s
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D
16 m/s
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E
0 m/s
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Solution
The correct option is D 0 m/s Given : h=40 m m=2kgu=0m/s