Q.

Two blocks of masses 2 kg and 1 kg are placed on a smooth horizontal table in contact with each other as shown fig. A horizontal force of 3 newton isapplied on the first so that the block moves with a constant acceleration. The force between the blocks would be

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a

3 newton

b

2 newton

c

l newton

d

zero

answer is C.

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Detailed Solution

Let F be the force between the blocks and a their common acceleration. Then for 2 kg block,3 - F = 2a                                 … (1)For 1 kg block, F = 1 × a = a    …(2)∴3 - F = 2 For 3 F = 3 or F = 1 newton.
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