A 1700 kg car moving at 10 m/s collides head-on with a 1400 kg car moving at 4 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 1100 kg car moving at 15 m/s collides head-on with a 1000 kg car moving at 9 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 1300 kg car moving at 15 m/s runs into a stationary 1200 kg car and the two lock together. How much kinetic energy ΔK is lost in the collision?
A 4.5 kg glider moving at 11 m/s makes a perfectly elastic head-on collision with a 0.5 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 10 g bullet is fired horizontally into a 2 kg block hanging from light strings 0.8 m long, and stays in it. The strings swing out to a largest angle of 40° from the vertical. Use g = 9.81 m/s². Find the speed v of the bullet before impact.
A 0.1 kg ball hits a wall at 26 m/s and bounces straight back at 15 m/s. The contact lasts 40 ms. Find the average force Favg of the wall on the ball.
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