Particles A and B, of masses 0.2 kg and 0.45 kg respectively, are connected by a light inextensible
string of length 2.8 m. The string passes over a small smooth pulley at the edge of a rough horizontal
surface, which is 2 m above the ﬂoor. Particle A is held in contact with the surface at a distance of
2.1 m from the pulley and particle B hangs freely. The coefﬁcient of friction between
A and the surface is 0.3. Particle A is released and the system begins to move.
(i) Find the acceleration of the particles and show that the speed of B immediately before it hits the
ﬂoor is 3.95

Question

Particles A and B, of masses 0.2 kg and 0.45 kg respectively, are connected by a light inextensible
string of length 2.8 m. The string passes over a small smooth pulley at the edge of a rough horizontal
surface, which is 2 m above the ﬂoor. Particle A is held in contact with the surface at a distance of
2.1 m from the pulley and particle B hangs freely. The coefﬁcient of friction between
A and the surface is 0.3. Particle A is released and the system begins to move.
(i) Find the acceleration of the particles and show that the speed of B immediately before it hits the
ﬂoor is 3.95

abmon98 · Answer

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s10_qp_42.pdf Question 6

anonymous · Answer

Technically this is a physics question, but i beleive i can solve it. Hold on.

abmon98 · Answer

4.5-T=0.45a
T-(2*0.3)=0.2a

abmon98 · Answer

Solve simultaneous equation to get the acceleration of 6ms^-2 and a tension of 1.8

anonymous · Answer

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