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Impulse and average force 
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#1
Nov1007, 08:17 PM

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i dont understand wat im doing wrong here is my problem
Choose the positive direction to be from the pitcher to the plate (some answers may be negative). A pitcher throws a 0.13 kg baseball so that it crosses home plate horizontally with a speed of 31 m/s. It is hit straight back at the pitcher with a final speed of 28 m/s. What is the impulse delivered to the ball? Answer in units of kg m/s Find the average force exerted by the bat on the ball if the two are in contact for 0.0011 s. Answer in units of N ok here is my work Impulse=m(vfvi) .13(2831)=.39 then for average force i have I=t*af .39=.0011*af af=354.5454545 but i change my signs to positive right?? either way my answer is wrong help please 


#2
Nov1007, 09:53 PM

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