A 1100 kg car moving at 5 m/s collides head-on with a 1800 kg car moving at 12 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 6 kg rifle, free to move, fires an 8 g bullet at 550 m/s. Both start at rest. Find the recoil speed V of the rifle.
A 2.5 kg glider moving at 9 m/s makes a perfectly elastic head-on collision with a 0.5 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 4.5 kg glider moving at 6 m/s makes a perfectly elastic head-on collision with a 2 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 0.25 kg ball hits a wall at 10 m/s and bounces straight back at 15 m/s. The contact lasts 5 ms. Find the average force Favg of the wall on the ball.
A 0.5 kg ball hits a wall at 22 m/s and bounces straight back at 6 m/s. The contact lasts 10 ms. Find the magnitude of the impulse J the wall gives the ball.
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