Asked by Angie

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?
Answered by Damon
change of momentum = force * time

.320 (40+64) = 755 t
Answered by Angie
thank you!
Answered by Damon
You are welcome.
Answered by Angie
why do you add the 40 and 64...should you not calculate the change in them?
Answered by Damon
opposite directions

64 - (-40) = 64 + 40

Answered by Damon
the change from 40 east to 64 west is 40+64 :)
Answered by Angie
understood thanks! i was overlooking the opposite direction
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