A stone is dropped into a well of 20 m deep. Another stone is thrown downward with
velocity 'v' one second later. If both stones
reach the water surface in the well simultan-
eously, v is equal to
(g = 10 ms
1) 30 ms" 2) 15 ms 3) 20 ms! 4) 10 ms.
pls give clear answer pls with solution
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