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  4. A ball is dropped from a bridge 122.5m above a river. After 2s, a second ball is thrown down after it. What must its initial velocity be so that both hit the water at the same time

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Q. A ball is dropped from a bridge 122.5m above a river. After 2s, a second ball is thrown down after it. What must its initial velocity be so that both hit the water at the same time

Motion in a Straight Line

Solution:

For first ball $h = ut + \frac{1}{2} gt^2$
For second ball $h = \nu (t - 2) + \frac{1}{2} g(t - 2)^2$