A 2.5 kg trolley moving at 2 m/s runs into a 3.5 kg trolley at rest. After the collision the first trolley continues in the same direction at 0.5 m/s. Find the velocity v′2 of the second trolley.
A 700 kg car moving at 19 m/s runs into a stationary 900 kg car. The cars lock together. Find their common velocity v′ just after the collision (positive in the first car’s direction).
A 13 kg projectile moving horizontally at 24 m/s explodes into two fragments that move along the same line. The 10 kg fragment continues forwards at 84 m/s. Find the velocity v′2 of the 3 kg fragment (positive in the original direction).
A 4.5 kg glider moving at 5 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 0.15 kg ball hits a wall at 27 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 0.4 kg ball hits a wall at 13 m/s and bounces straight back at 4 m/s. The contact lasts 5 ms. Find the magnitude of the impulse J the wall gives the ball.
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