Physics · May / June 2022 · Paper 42 · Question 2
0625
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Fig. 2.1 shows an object of mass 2.0 kg on a bench. This object is connected by a cord, passing over a pulley, to an object of mass 3.0 kg. 3.0 kg object 2.0 kg object 2.0 cm card cord pulley F bench Fig. 2.1 The 2.0 kg object is released from rest and accelerates at 4.0 m / s2.
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2(a)[2]
(F = 2.0 × 4.0 =) 8.0 N
(F =) ma in any form
C1
2(b)[3]
(F = 30 – 12 =) 18 N
resultant force on 3 kg mass (3 × 4 =) 12 (N)
C1 (weight of 3 kg mass = 3 × 10) = 30 (N)
C1
2(c)(i)[2]
(Δv =) 4.0 × 0.80 (= 3.2 m / s)
(Δ)v = at in any form
C1
2(c)(ii)[2]
(t = 0.020 / 3.2 =) 0.0063 s OR 6.3 × 10–3 s
(t =) d / v in any form
C1
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