A) 60 m/sec
B) 65 m/sec
C) 70 m/sec
D) 75 m/sec
Correct Answer: B
Solution :
Speed of stone in a vertically upward direction is 20m/s. So for vertical downward motion we will consider \[u=-20\ m/s\] \[{{v}^{2}}={{u}^{2}}+2gh={{(-20)}^{2}}+2\times 9.8\times 200=4320\ m/s\] \\[v\tilde{-}65\,m/s\].
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