Physics · May / June 2024 · Paper 41 · Question 2
0625
As printed in the paper
The question as text
Fig. 2.1 shows two identical trolleys, P and Q, held at rest on a frictionless horizontal surface. A load is fixed to trolley P. 1.5 kg load trolley P trolley Q compressed spring Fig. 2.1 There is a compressed spring between trolley P and trolley Q. The trolleys are released. As the spring expands, it pushes the trolleys apart. Trolley Q moves to the right at a constant speed of 0.36 m / s. The mass of each trolley is 1.2 kg. The mass of the load on trolley P is 1.5 kg. The spring has negligible mass.
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2(a)(i)[3]
0.16 m / s
conservation of momentum OR mP vP = mQvQ OR 2.7 × vP = 1.2 × 0.36 OR (mQvQ =) 0.432 seen
(vP =) mQvQ / mP OR 1.2 × 0.36 / 2.7
2(a)(ii)[3]
0.078 J
(k.e. =) ½mv2 OR (k.e. =) ½ × 1.2 × 0.362
(k.e. =) ½ × 1.2 × 0.362
2(b)[2]
(from) elastic (energy store in the compressed spring)
to kinetic (as final energy store of trolleys)
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