A 70 kg man holding a 0
857 kg ball stands
on a frozen pond next to a wall. He throws
the ball at the wall with a speed of 11
(relative to the ground) and then catches the
ball after it rebounds from the wall.
How fast is he moving after he catches the
ball? Ignore the projectile motion of the ball,
and assume that it loses no energy in its colli-
sion with the wall.
Answer in units of m