A $150$g ball is thrown vertically upward from a window $10$m above the ground at a speed of $30$m$/$s$.$ At the top of its trajectory, it compresses a spring a distance, y$.($spring constant k $=1\mathrm{.}5$ N$/$m$).$ If the spring is $45$m above the initial starting position of the ball:

A$)$ How high does the ball go above the ground?

B$)$ What is the speed of the ball when it strikes the ground?

Please show all equations, substitutions, algebraic steps, and label variables. Thank you!