Posted by Alex on .
I have been stuck on this for a while now and cant figure out what it is i am doing wrong HELP!!!
A tennis ball with a velocity of 15.5 m/s is
thrown perpendicularly at a wall. After strik
ing the wall, the ball rebounds in the opposite
direction with a speed of 9.3 m/s.
If the ball is in contact with the wall for
0.015 s, what is the average acceleration of
the ball while it is in contact with the wall?

physics 
Henry,
aq = (VVo)/t = (9.315.5) 0.015=1660
m/s^2.
NOTE: The final velocity is in the opposite direction. Therefore, it is
NEGATIVE.
A 2nd interpretation:
While the ball is in contact with the wall, its' velocity is o.
a = (015.5) / 0.015 = 1033.3 m/s^2.