Momentum & collisions worksheet with answers

A 0.35 kg ball at rest is kicked. The foot pushes it with an average force of 450 N for 20 ms. Find the speed v of the ball just after the kick.

A 500 kg car moving at 7 m/s collides head-on with a 1400 kg car moving at 5 m/s in the opposite direction. The cars lock together. Find their common velocity v′ just after the collision (positive in the first car’s direction).

A 5 kg glider moving at 10 m/s makes a perfectly elastic head-on collision with a 4.5 kg glider at rest on a frictionless track. Find the velocity v′₁ of the first glider after the collision (positive in its original direction).

An 800 kg car moving at 11 m/s runs into a stationary 700 kg car and the two lock together. How much kinetic energy ΔK is lost in the collision?

At a crossing a 1100 kg car travelling east at 15 m/s collides with a 900 kg car travelling north at 15 m/s. The cars lock together. Find the direction θ of the wreck just after the collision, measured north of east.

A 12 g bullet is fired horizontally into a 5 kg block hanging from light strings 1 m long, and stays in it. The strings swing out to a largest angle of 15° from the vertical. Use g = 9.81 m/s². Find the speed v of the bullet before impact.