Question

reset Collision Carts pause 0.4 m/s 1.6 m/s Initial Velocity Initial Velocity 2 m/s O m/s Mass: 2 kg Mass: 3 kg Elastic Collision Inelastic Collision Explosion

Answer 1

vi(red) = 2 m/s, vi(red) = 0 m/s

vf(red) = - 0.4 m/s, vf(blue) = 1.6 m/s

Before collision,

P(red) = 2*2 = 4 kg m/s

P(blue) = 3*0 = 0 kg m/s

After collision,

P(red) = 2*(-0.4) = - 0.8 kg m/s

P(blue) = 3*1.6 = 4.8 kg m/s

Total momentum of system,

P(before) = 4+0 = 4 kg m/s

P(after) = - 0.8+4.8 = 4 kg m/s

Change in momentum is,

P(after) - P(before) = 4 - 4 = 0

There is no change in momentum in elastic collision.