A 2 kg trolley moving at 5 m/s runs into a 2.5 kg trolley at rest. After the collision the first trolley continues in the same direction at 2 m/s. Find the velocity v′2 of the second trolley.
A 3 kg rifle, free to move, fires a 12 g bullet at 900 m/s. Both start at rest. Find the recoil speed V of the rifle.
A 1 kg glider moving at 9 m/s makes a perfectly elastic head-on collision with a 4 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 3 kg glider moving at 5 m/s makes a perfectly elastic head-on collision with a 2.5 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 10 m/s and bounces straight back at 13 m/s. The contact lasts 5 ms. Find the average force Favg of the wall on the ball.
At a crossing a 1100 kg car travelling east at 19 m/s collides with an 800 kg car travelling north at 18 m/s. The cars lock together. Find the speed v′ of the wreck just after the collision.
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