A stone is projected vertically up from the ground with velocityy 40ms^(-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=10ms^(-2))

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

1.	A stone is projected vertically up from the ground with velocityy 40ms^(-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=10ms^(-2))
Answer» 4 s 6 s 8 s 12 s Answer :A