Item 7 Part A In a Little League baseball game, the 145 g ball enters the strike

Question

Item 7 Part A In a Little League baseball game, the 145 g ball enters the strike zone with a speed of 11.0 m/s.The batter hits the ball, and it leaves his bat with a speed of 25.0 m/s in exactly the opposite direction. What is the magnitude of the impulse delivered by the bat to the ball? Express your answer to three significant figures and include the appropriate units. J 2.03 Units Submit My Answers Give Up Incorrect; Try Again; 4 attempts remaining Your answer does not have the correct dimensions. Part B If the bat is in contact with the ball for 1.2 ms, what is the magnitude of the average force exerted by the bat on the ball? Express your answer to two significant figures and include the appropriate units. FValue Units

Explanation / Answer

a] impulse delivered = change in momentum

= 0.145*25- - 0.145*11

= 5.22 kg m/s

b] Force = impulse/time

= 5.22/0.0012 = 4350

= 4.4*10^3 N

6] By momentum conservation,

3m*2.5 + m*4.3 + m*0 = 5m v

v = [7.5+4.3]/5

= 2.4 m/s

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