A steel sphere of mass 100 gm moving with a velocity of 4 m/s collides with a dust particle elastically moving in the same direction with a velocity of 1 m/s. The velocity of the dust particle after the collision is (dust particle is of mass neglisiable)

A steel sphere of mass 100 gm moving with a velocity of 4 m/s collides

1.	A steel sphere of mass 100 gm moving with a velocity of 4 m/s collides with a dust particle elastically moving in the same direction with a velocity of 1 m/s. The velocity of the dust particle after the collision is (dust particle is of mass neglisiable)
Answer» 8 m/s 7 m/s 6 m/s 9 m/s Answer :B