Question

Two balls of masses 100 g and 50 g are moving along the same straight line with velocities 2 m's and 1 m/s respectively.The collide and after the collision the first ball moves with velocity of 1.5 m/s in the same direction.Find the magnitude of velocity of the second ball

Answer 1

m1u1+m2u2=m1v1+m2v2
0.1×2+0.05×1=0.1×1.5+0.05×v2
0.2+0.05=0.05+0.05×v2
0.25=0.05+0.05×v2
0.25-0.05=0.05×v2
0.2÷0.05=v2
(2×10)/5=v2
20/5=v2
v2=4m/s

Answer 2

1.75 m/s
this is answer