Hey I am doing some exam questions from a mechanics textbook and I am really confused I was just wondering if anyone could help me out The question is:

A ball is thrown upwards at 7ms from a point A which is 8m vertically above horizontal ground. Given that the ball moves freely under gravity find:

the greatest height above the ground attained by the ball

the speed of the ball the instant it when it strikes the ground

Thanks alot :)

A ball is thrown vertically upwards and takes 3 seconds to reach its highest point. Find the times at which the ball is 39.2m above its point of projection.