find the answer to the following question

Let the initial velocity(modulas) be u and final velocity be v.

Now v_x=ucos30

v_y=usin30-gt

Angle at which ball strikes=45

Now tan45=-vy/vx

Hence vy=vx

or ucos30=-usin30+5g

or u=50/(sin30+cos30)=36.6 ms^-1

h=|usin30(5)-0.5(10)(25)|=|125/(sin30+cos30)-125|=33.5 m