Question

truck with a mass of 1840 kg and moving with a speed of 17.0 m/s rear-ends a 732 kg car stopped at an intersection. The collision is approximately elastic since the car is in neutral, the brakes are off, the metal bumpers line up well and do not get damaged.

(a)

Calculate the initial momentum of the truck (in kg m/s).

kg m/s

(b)

Calculate the final velocities (in m/s) for the truck and the car.

v_tf = m/s v_cf = m/s

(c)

Calculate the total momentum (in kg m/s) of the truck AND the car after the collision.

kg m/s

(d)

Did you expect the results that you got for Part (a) and (c)?

Yes, since the collision is inelastic. No, since kinetic energy may not be conserved.     No, since there were no forces acting on either the car or the truck during the collision. Yes, since momentum is conserved in a collision with no external forces acting on the colliding objects.

Answer 1

D. Yes since momentumnis conserved and there is no external force on the system.

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