Posted by **Alex** on Monday, August 20, 2012 at 5:56pm.

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**, Monday, August 20, 2012 at 9:44pm
aq = (V-Vo)/t = (-9.3-15.5) 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 = (0-15.5) / 0.015 = 1033.3 m/s^2.

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