Question

The diagram shows a collision between a 4.0 kg toy car and a stationary 8.0 kg toy truck. After the collision, the car bounces back at 1.0 m/s while the truck goes forward at 2.0 m/s. Based on these values, are momentum and kinetic energy conserved?

Image at bottom of the page:

I think that both are conserved but that is not the correct answer.
I cannot paste the link to the image.

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