How can I find initial velocity without a time?

Question

Say a ball is thrown past a window 15m above the street with a verticle speed of 10 m/s. If the ball was thrown from the street what is the initial speed.

Answer 1

I'll give you a hand. Just use the correct equation of motion (only one does not include time). The equations are given below



V=U+AT

S=UT+1/2AT^2

V^2=U^2+2AS