A 1400 kg car moving at 18 m/s collides head-on with a 1100 kg car moving at 5 m/s in the opposite direction. The cars lock together. Find their common velocity v′ just after the collision (positive in the first car’s direction).
A 2000 kg car moving at 14 m/s collides head-on with a 500 kg car moving at 14 m/s in the opposite direction. The cars lock together. Find their common velocity v′ just after the collision (positive in the first car’s direction).
A 5 kg glider moving at 7 m/s makes a perfectly elastic head-on collision with a 4 kg glider at rest on a frictionless track. Find the velocity v′2 of the second glider after the collision.
A 1.5 kg glider moving at 8 m/s makes a perfectly elastic head-on collision with a 1 kg glider at rest on a frictionless track. Find the velocity v′2 of the second glider after the collision.
A 10 g bullet is fired horizontally into a 2 kg block hanging from light strings 1.2 m long, and stays in it. The strings swing out to a largest angle of 20° from the vertical. Use g = 9.81 m/s². Find the speed v of the bullet before impact.
A 0.2 kg ball hits a wall at 21 m/s and bounces straight back at 8 m/s. The contact lasts 25 ms. Find the magnitude of the impulse J the wall gives the ball.
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