A tower is 24m high. A stone is projected upwards from the tower with initial velocity of 24,5 m/s. Calculate how long it would take for the stone to reach the ground at the foot of the tower.

Answer 1

you know that the height at time t seconds is

h(t) = 24 + 24.5t - 4.9t^2

so, just solve for t when the stone hits the ground (its height is zero).

Answer 2

3,663sec & 1,337sec