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Determining impulse on baseball from bat given velocity change

  • #1

Homework Statement


A(n) 0.182 kg baseball is thrown with a speed of 15.3 m/s. It is hit straight back at the
pitcher with a final speed of 10.4 m/s. What is the magnitude of the impulse delivered to the ball?

Homework Equations


impulse=mass*change of velocity

The Attempt at a Solution


.182*-4.9(change in velocity)=-.8918 answer is wrong is it the sign
 

Answers and Replies

  • #2
Filip Larsen
Gold Member
1,237
169


It is a sign problem, yes. Select a direction and write speeds in that direction as positive numbers and speeds in the opposite direction as negative numbers and try again (hint: the change in velocity is not 4.9 m/s but 25.7 m/s).
 

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