# physics

posted by Bella

A 20 kg shopping cart moving at a velocity of 0.5 m/s collides with a store wall and stops. The momentum of the shopping cart

decreases?

1. drwls

yes; the momentum becomes zero. That is a reduction

2. Bella

what would it mean if i say
the momentum is conserved?

3. drwls

It is irrelevant to the question. The momentum of the cart is not conserved, because a force of impact is applied to it. The momentum of the cart PLUS wall is also not conserved, because of stress forces applied at the base of the wall.

4. Bella

ok, i was just wondering since that was one of my choices

thanks

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