Question

A body of mass 2kg moving with uniform velocity of 40 m/s collides with another body at rest. If the two bodies move together with a velocity of 25m/s, mass of the other body is

Answer 1

let mass of other body be m.

momentum of 1st =2×40kgm/s=80kgm/s


since velocity of both bodies together after collision is 25m/s
so mass of both bodies together =2kg+m kg

since momentum is conserved

so 80kgm/s=25m/s× (2kg+m kg)
2+m=80/25
m=3.2-2=1.2

Hence mass of 2nd body is 1.2kg

Answer 2

Answer:

mass of second body is 1.2kg