A billiard ball of mass 0.28 kg hits a second, identical ball at a speed of 7.2 m/s and comes to rest as the second ball flies off. The collision takes 250 μs. What is the average force on the first ball? The second ball?

A 100-g bat collides with a stationary 1.2 kg teddy bear. Immediately after the collision, the bat is traveling at an angle of 55 degrees from its original path. The bear is traveling in a direction 35 degrees from the original path of the bat. (All the motion occurs in two dimensions). If the bear is moving at 0.060 m/s immediately after the collision, how fast is the bat moving after the collision?

A 0.60 kg ball is thrown horizontally at 20 m/s in the -x direction and collides with a 5.0 kg box which is at rest on a frictionless floor. After the collision, the ball is traveling at 15 m/s in the +x direction. What is the box's velocity after the collision (all answers below are in the +x or -x direction; the figure below shows the directions of the ball's velocities)? Before: After: ÜBox;a =? ÜBOX;b = 0 îbalu;b of Ûdall;a %3D O -4.2 m/s O 5.0 m/s O -35 m/s O -20 m/s O 21 m/s

2 balls collide head-on in an elastic collision. One ball has a mass of 4.0 kg and an initial velocity of 6.5 m/s. The second ball has a mass of 2.0 kg and its initial velocity is unknown. AFTER the collision the heavier ball has a velocity of 2.5 m/s. What is the velocity of the lighter ball before and after the collision?