A 3 kg trolley moving at 8 m/s runs into a 4.5 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 1200 kg car moving at 21 m/s runs into a stationary 1400 kg car. The cars lock together. Find their common velocity v′ just after the collision (positive in the first car’s direction).
A 4 kg glider moving at 4 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′2 of the second glider after the collision.
An 8 kg projectile moving horizontally at 23 m/s explodes into two fragments that move along the same line. The 4 kg fragment continues forwards at 68 m/s. Find the velocity v′2 of the 4 kg fragment (positive in the original direction).
A 1400 kg car runs into a parked 1600 kg car. The wrecks lock together and skid 5 m before stopping. The coefficient of kinetic friction between tyres and road is 0.6. Use g = 9.81 m/s². Find the speed v1 of the first car just before the collision.
A 0.2 kg ball hits a wall at 12 m/s and bounces straight back at 14 m/s. The contact lasts 10 ms. Find the average force Favg of the wall on the ball.
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