A 700 kg car moving at 19 m/s collides head-on with a 1100 kg car moving at 15 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 0.2 kg ball at rest is kicked. The foot pushes it with an average force of 150 N for 12 ms. Find the speed v of the ball just after the kick.
A 2000 kg car moving at 17 m/s runs into a stationary 900 kg car and the two lock together. How much kinetic energy ΔK is lost in the collision?
A 2.5 kg glider moving at 5 m/s makes a perfectly elastic head-on collision with a 4.5 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).
At a crossing a 1900 kg car travelling east at 23 m/s collides with a 1000 kg car travelling north at 13 m/s. The cars lock together. Find the speed v′ of the wreck just after the collision.
A 0.45 kg ball hits a wall at 27 m/s and bounces straight back at 12 m/s. The contact lasts 40 ms. Find the average force Favg of the wall on the ball.
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