Question

If a troller is moving with the velocity of 20m/sec.The mass of troller is 100.8kg.A ball of mass 0.2kg is moving with the velocity of 5m/sec.The ball falls on the troller.What is the final velocity of ball,troller together?​

Answer 1

Explanation:

let m be the mass of ball, M be mass of troller, u be the velocity of ball & v be the velocity of troller, V is the velocity of ball & troller

conservation of momentum

m*u + M*v=(m+M)*V

0.2*5+(100.8*20)=(100.8+0.2)*V

1+2016 = (101)*V

V = 2017/101 = 19.97 m/sec

this might be the answer.