A 3 kg trolley moving at 2.5 m/s runs into a 1.5 kg trolley at rest. After the collision the first trolley continues in the same direction at 1.5 m/s. Find the velocity v′2 of the second trolley.
A 0.45 kg ball at rest is kicked. The foot pushes it with an average force of 600 N for 20 ms. Find the speed v of the ball just after the kick.
A 0.5 kg glider moving at 5 m/s makes a perfectly elastic head-on collision with a 1 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 5 kg glider moving at 10 m/s makes a perfectly elastic head-on collision with a 3.5 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 0.45 kg ball hits a wall at 15 m/s and bounces straight back at 18 m/s. The contact lasts 5 ms. Find the average force Favg of the wall on the ball.
A 20 g bullet is fired horizontally into a 1 kg block hanging from light strings 0.9 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.
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