A 1500-kg car traveling due north with a speed of 25 m/s collides head-on with a 4500-kg

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A 1500-kg car traveling due north with a speed of 25 m/s collides head-on with a 4500-kg truck traveling due south with a speed of 15 m/s. The two vehicles stick together after the collision.
a. What is the total momentum of the system prior to the collision?
b. What is the velocity of the two vehicles just after the collision?
c. What is the total kinetic energy of the system before the collision?
d. What is the total kinetic energy just after the collision?
e. Is the collision elastic? Explain.

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