A piece of stone is thrown vertically upwards. It reaches the maximum height in 3 seconds. If the acceleration of the stone be 9.8 m/s2 directed towards the ground, calculate the initial velocity of the stone with which it is thrown upwards.

Initial velocity of the stone, u=?

Final velocity of stone, v=0


Acceleration due to gravity, g= -9.8m/s2


Time, t=3 sec


Using relation, v=u + gt


0 = u - 9.8 x 3


u = 29.4m/s


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