Question

A body of mass m moving at velocity v collides with a stationary body

Answer 1

Let's say ,
the moving mass = m1 & the stationary body mass = m2
initial velocity of m1 = v1 & initial velocity of m2 = v2
final velocity of m1 = u1 & final velocity of m2 = u2

m1v1 + m2v2 = m1u1 + m1u1

v2 = 0 & u1 = 0



Hope it will right
but the question is not clear .

Answer 2

here is ur answer..
let mass of one body is m1 and initial velocity of that body is v1 ,final velocity of that body is u1
let another body with mass m1 ,initial velocity v2 and final velocity u2
when body bodies collide than due to the law of conservation of liner momentum or by the law conservation of energy
initial momentum =final momentum
m1v1+m2v2=m1u1+m2u2
hope it helps uhhh