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**Acceleration HELP!!!**

A fastball that traveled to home plate (20 meters) in .4seconds.

a.what is the average speed of the ball?

b.if the catcher allowed his mitt to recoil backwards 7cm while catching the ball, what was the acceleration of the ball while it was slowed down by the catcher?

c.what amount of time was used to slow the ball down?

ATTEMPT

d/t=ave velocity= 50m/s^2

Vo=50m/s

Vf=0

t=.4s

d=20m

.07/25=.0028=t

-I dont know if my calculations are all correct please help me. I have the answer to a. which is 50m, just not to b, and c.

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