What was the average force exerted by the ball on the glove?

[znz786]

I need help with this problem. I have no idea how to start it

A baseball that weighs 140 g and is traveling at 30 m/s moves a fielder's glove 35 cm backward when the ball is caught. What was the average force exerted by the ball on the glove.

Thanks in advance

 

[Doc Al]

Hint: Consider the work done by the glove.