| 18. | A system consists of three billiard balls. Each ball has mass m and is traveling at speed v. One ball is traveling north, another ball is traveling east, and the third ball is traveling south. What is the momentum of the system? | ||||||||
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| 19. | A 0.24-kg blob of clay strikes a wall with an initial velocity of 25m/s. The clay comes to a stop against the wall in 91ms What is the average impact force on the clay? | ||||||||
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| 20. | 
A block of mass m = 4.4 kg slides from left to right across a frictionless surface with a speed Vi=8.4m/s. It collides in a perfectly elastic collision with a block of mass M that is at rest. After the collision, the 4.4-kg block reverses direction, and its new speed is Vf=2.5 m/s What is M? |
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