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A ball mass 150g with intial velocity 12 m/s strikes a bat and bounce back with velocity 20m/s .find average force In answer please tell how you take intial velocity in negative =-12m/s

A ball mass 150g with intial velocity 12 m/s strikes a bat and bounce back with velocity 20m/s .find average force
 
 
 
 
 
 
In answer please tell how you take intial velocity in negative =-12m/s

Grade:11

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