A 1100 kg car moving at 11 m/s collides head-on with a 1100 kg car moving at 13 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 0.05 kg ball at rest is kicked. The foot pushes it with an average force of 650 N for 2 ms. Find the speed v of the ball just after the kick.
A 3.5 kg glider moving at 9 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′1 of the first glider after the collision (positive in its original direction).
An 18 kg projectile moving horizontally at 12 m/s explodes into two fragments that move along the same line. The 1 kg fragment continues forwards at 50 m/s. Find the velocity v′2 of the 17 kg fragment (positive in the original direction).
A 0.6 kg ball hits a wall at 27 m/s and bounces straight back at 20 m/s. The contact lasts 20 ms. Find the average force Favg of the wall on the ball.
A 0.55 kg ball hits a wall at 20 m/s and bounces straight back at 19 m/s. The contact lasts 10 ms. Find the average force Favg of the wall on the ball.
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