Cart A is launched toward Cart B on a frictionless track — watch the total momentum hold steady.
Momentum & Collisions
Set the masses, speeds and bounciness, then run the collision. Total momentum stays constant; kinetic energy only survives a perfectly elastic hit (e = 1).
2.0 kg
1.0 kg
4.0 m/s
0.0 m/s
1.00
Momentum before
8.00
kg·m/s
Momentum after
8.00
kg·m/s
KE before
16.00
joules
KE after
16.00
joules
Final v₁
1.33
m/s
Final v₂
5.33
m/s
Kinetic energy lost to heat / sound
0.00 J
Total momentum is conserved — before equals after.