A stone is shot straight upward with a speed of 20m/sec from a tower 25 m high. The speed with which it strikes the ground is approximately.
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v^2 = u^2 +2as
0 = (20)^2 + 2(-10)S
S = 20
TOTAL DISTANCE REQUIRED TO TRAVEL TO HIT THE GROUND
=25 + 20 = 45
v^2 = u^2 +2as
v^2 = 0 + 2 × 10 × 45
v^2 = 900
v = 30 m/s
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