A 1.5 kg trolley moving at 8.5 m/s runs into a 2.5 kg trolley at rest. After the collision the first trolley continues in the same direction at 3 m/s. Find the velocity v′2 of the second trolley.
A 3.5 kg rifle, free to move, fires a 5 g bullet at 750 m/s. Both start at rest. Find the recoil speed V of the rifle.
A 1600 kg car moving at 12 m/s runs into a stationary 1000 kg car and the two lock together. How much kinetic energy ΔK is lost in the collision?
A 12 g bullet is fired horizontally into a 1.5 kg wooden block hanging on light strings, and stays inside it. The block swings up until it is 23 cm higher than at the start. Use g = 9.81 m/s². Find the speed v of the bullet before impact.
A 1800 kg car runs into a parked 800 kg car. The wrecks lock together and skid 8 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 15 m/s and bounces straight back at 20 m/s. The contact lasts 40 ms. Find the magnitude of the impulse J the wall gives the ball.
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