A stone is projected vertically up from the ground with velocity 40 ms^(-1) . The interval of time between the two instants at which the stone is at a height of 60 m above the ground is (g = 10 "ms"^(-2))

A stone is projected vertically up from the ground with velocity 40 ms

1.	A stone is projected vertically up from the ground with velocity 40 ms^(-1) . The interval of time between the two instants at which the stone is at a height of 60 m above the ground is (g = 10 "ms"^(-2))
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