A stone is thrown vertically upward. On its way up it passes point A with speed v, and point B,

Question

7.85 m higher than A, with speed v. Calculate (a) the speed v and (b) the maximum height
reached by the stone above point B.

Answer 1

You must have copied the problem incorrectly. It cannot have the same speed "v" at two different heights.

That would violate the law of conservation of energy.