Momentum and Impulse

Momentum is defined by the formula : P=mv

Momentum is always conserved, assuming there are no external forces acting on the objects before and after a collision.

This is the CONSERVATION OF MOMENTUM.

A skater of mass 75kg and velocity 4m/s collides with a stationary skater of mass 50kg and they join together, moving in the same direction. What's velocity after the impact?

m1u1+m2u2=m1v1+m2v2

m1= 75kg m2=50kg

u1= 4m/s u2= 0m/s 

75*4= 300kgm/s 300kgm/s = 125v v=2.4m/s 

In explosions, if an air rifle shoots a bullet, forward momentum gained by it will equal the recoil of the…