Physics
posted by Lans VS .
A stone is projected vertically upwards with velocity 40 m/s. Show that the stone will reach the point of projection with the same velocity.

hmax = (V^2Vo^2)/2g.
hmax = (01600)/19.6 = 81.6 m.
V^2 = Vo^2 + 2g*hmax.
V^2 = 0 + 19.6*81.6 = 1600
V = 40 m/s.