A 5 kg trolley moving at 8.5 m/s runs into a 4 kg trolley at rest. After the collision the first trolley continues in the same direction at 4 m/s. Find the velocity v′2 of the second trolley.
A 5.5 kg rifle, free to move, fires an 8 g bullet at 850 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 2 kg glider at rest on a frictionless track. Find the velocity v′2 of the second glider after the collision.
A 10 g bullet is fired horizontally into a 1 kg wooden block hanging on light strings, and stays inside it. The block swings up until it is 19 cm higher than at the start. Use g = 9.81 m/s². Find the speed v of the bullet before impact.
At a crossing an 800 kg car travelling east at 10 m/s collides with a 1000 kg car travelling north at 10 m/s. The cars lock together. Find the speed v′ of the wreck just after the collision.
A 0.35 kg ball hits a wall at 24 m/s and bounces straight back at 18 m/s. The contact lasts 10 ms. Find the average force Favg of the wall on the ball.
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