A stone is dropped into a river from a bridge 46.5 m above the water. Another stone is thrown vertically down 1.28 s after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second stone ?
now,if the 1st stone after dropping(i.e it had no initial velocity) took time
So,comparing the above three equations we can write,
now,solving equation 1 and 2 we get,