A bat exerts force of 755N on a 320g ball that approaches the bat at 40 m/s and leaves at 64 m/s. How long was the ball in contact with the bat?

change of momentum = force * time

.320 (40+64) = 755 t

thank you!

You are welcome.

why do you add the 40 and 64...should you not calculate the change in them?

opposite directions

64 - (-40) = 64 + 40

the change from 40 east to 64 west is 40+64 :)

understood thanks! i was overlooking the opposite direction