A 4 kg trolley moving at 6 m/s runs into a 2.5 kg trolley at rest. After the collision the first trolley continues in the same direction at 3 m/s. Find the velocity v′2 of the second trolley.
A 0.25 kg ball at rest is kicked. The foot pushes it with an average force of 750 N for 8 ms. Find the speed v of the ball just after the kick.
An 800 kg car moving at 25 m/s runs into a stationary 2000 kg car and the two lock together. What percentage ΔK/K of the original kinetic energy is lost?
A 0.5 kg glider moving at 7 m/s makes a perfectly elastic head-on collision with a 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).
A 0.55 kg ball hits a wall at 23 m/s and bounces straight back at 10 m/s. The contact lasts 5 ms. Find the magnitude of the impulse J the wall gives the ball.
A 0.6 kg ball hits a wall at 29 m/s and bounces straight back at 12 m/s. The contact lasts 25 ms. Find the magnitude of the impulse J the wall gives the ball.
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