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Physics - Collisions - Problems with Solutions and Tutorials

collisions
A 2.72 kg ball travels at 9.81 m/s, a 3.14 kg ball travels in the opposite direction at 8.31 m/s. They collide head on. After the collision, the 2.72 kg ball rebounds with a speed of 8 m/s. What is the speed of the other ball?

Answer: 7.12 m/s

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Tutorial video:
collisions
m1 (1g) travels east at 3 ft/s. m2 (1.2g) travels west at 4 ft/s. After they collide, m1 travels at 2.5 ft/s, 30 degrees south of east. Find the speed and direction of m2 (in ft/s).

Answer: v=3.46 ft/s, theta is 17 degrees N or W (163 degrees CCW)

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Tutorial video:
collisions
At a family reunion, Chef meets Marathon, his long lost brother. Crying and hollering, a 400 pound Chef charges at his brother with a speed of 5 m/s. Marathon, weighing 120 pounds, sprints toward his brother at a speed of 9 m/s. Chef and Marathon collide and stick together in an embrace of love. Find the resultant velocity.

Answer: 1.77 m/s

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Tutorial video:
collisions
A neutron is at rest and has a mass of 1.67e-27 kg. Suddenly, it emits an electron with a mass of 9.1e-31 kg, travelling at 1.6e+8 m/s. At what speed does the remaining proton recoil?

Answer: 87233 m/s

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Tutorial video:
collisions
Two balls travel toward each other. One has a mass of 2.46 kg, and a velocity of 3.21 m/s. The other has a mass of 6.42 kg, and a velocity of 1.23 m/s. They collide in a perfectly elastic collision. Find their velocities after the collision.

Answer: the signs of their original velocities reverse

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