A body is thrown vertically upwards and then falls back on the ground. Its potential energy is maximum

A body is thrown vertically upwards with a speed u. When does its potential energy becomes maximum.

If the stone is thrown up vertically and return to ground, its potential energy is maximum

A body is thrown vertically upward from a point A 125 m above the ground. It goes up to a maximum height of 250 m above the ground and passes through A on its downward journey. The velocity of the body when it is at a height of 70 m above the ground is (g=10 m//s^(2))

A body is thrown vertically upward from a point A 125 m above the ground. It goes up to a maximum height of 250 m above the ground and passes through A on its downward journey. The velocity of the body when it is at a height of 70 m above the ground is (g=10 m//s^(2))