Newtonian mechanics
Classical Mechanics
Level
2
A cricket ball of mass 145 g is moving with a velocity of 14m/s and is being hit by a bat,so that the ball is turned back with a velocity of 22m/s.The force of blow acts on the ball for 0.015s. What is the average force exerted by the bat on the ball?
345N
315N
348N
390N
650N
148N
685N
683N
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Since in this case the ball and bat act as action reaction pairs...we consider the bat as the reaction force... The ball hits the bat and exerts a force lets say F(1) and this the equal and opposite force will be F(2) This F(1)=F(2) THEREFORE m(1) a(1)=m(2) a(2) Since the mass is same...therefore a(1)=a(2) Therefore by using kinematics.... a(1)=14/(0.015-t) and a(2)=22/t Equate these two u will get t and then use this time t and find a(2) and replace it in F(2) And this the answer is 348 N Don't forget the mass is in grams convert first it to kg....