1.

A bullet of mass 50 gram moving with a velocity of 400 m/s strikes a wall and goes out from the other side with a velocity of 100 m/s. Calculate the work done in passing through the wall.

Answer»

Work done W = KE2 – KE1 

KE1 = 1/2m1v12 =4000 J 

KE2 = 1/2mv22 = 250 J 

Arriving at final answer 

W = KE2 – KE1 

= 4000 – 250 = 3750 J



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