Physics · May / June 2021 · Paper 41 · Question 2
0625
As printed in the paper
The question as text
Fig. 2.1 shows a wooden trolley of mass 1.2 kg at rest on the rough surface of a bench. trolley ball Fig. 2.1 A ball of mass 0.52 g travels horizontally towards the trolley. The ball embeds itself in the wood of the trolley. The trolley moves with an initial speed of 0.065 m / s.
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2(a)(i)[2]
0.078 N s or 0.078 kg m / s
(I =) mt(∆)vt in any form or 1.2 × 0.065
2(a)(ii)[2]
150 m / s
vb = (mt + vt) / mb in any form or initial momentum = final momentum
or 1.2(0052) × 0.065 / 0.00052 or 0.078(0338) / 0.00052
2(b)[3]
work done against / due to / because of friction or kinetic energy (of trolley) used to do work
kinetic energy decreases (to zero)
thermal energy produced
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