Question

5. A ball is thrown straight up from the ground with an unknown velocity. It returns to the ground after 4.0 s. With what velocity did it leave the ground?

Answer 1

Answer:

V=0

U=?

a=10m/s^2

t=4s

Using...

V=u+at

0=u+(10)4

0=u+40

U=-40m/s