A boy drops a ball from a cliff122.5m high.Find: a) How long does it takes the ball to fall to the ground?
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Height = h = 122.5 m
Force of gravitation = g = 10 m/s.
Initial velocity = u=0
Time =t= ??
By kinametical equation,
h = ut + 1/2× gt^2
By substituting the values,
122.5 = 0t + 1/2 × 10 × t^2
122.5 = 5t^2
t^2 = 122.5/5
t^2 = 24.5
t = under root 24,5
t = 4.949 seconds
Force of gravitation = g = 10 m/s.
Initial velocity = u=0
Time =t= ??
By kinametical equation,
h = ut + 1/2× gt^2
By substituting the values,
122.5 = 0t + 1/2 × 10 × t^2
122.5 = 5t^2
t^2 = 122.5/5
t^2 = 24.5
t = under root 24,5
t = 4.949 seconds
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