A 50,000-kg train car moving at 2 m/s collides and connects to another identical car initially at rest. –What is the momentum of the first train car before the collision?

–What is the final velocity of the two connected train cars?

-Is the momentum being conserved through out the collision? Explain why.

-Is the kinetic energy being conserved through out the collision? Explain why.

-Is this collision an elastic or inelastic collision? Explain why.

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2