QCEVault

Modelling motion — Question 227

Original QCE Vault practice · 5 marks

Q227 · Practice questionTechnology-freeComplex familiar5 marks

QUESTION 227 (5 marks)

On a frictionless arcade track, a 2 kg cart moves right at 6 m/s and a 1 kg cart moves left at 3 m/s. They collide and remain joined. External impulse is negligible.
Two carts approaching on a horizontal frictionless track. The 2 kg cart travels right at 6 m/s; the 1 kg cart travels left at 3 m/s. Mass labels lie above their carts.
a)
Find their common velocity immediately after collision.
[2 marks]
b)
Find kinetic energy lost and explain why momentum conservation does not imply energy conservation.
[3 marks]
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