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Q.

Three large box are kept stationary over one other as shown in figure. A horizontal force 20 N acts on middle block as shown in figure. Then select the correct statement(s).

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a

Acceleration of lowest block is 4.5 ms-2

b

Acceleration of upper most block is 2 ms-2

c

Friction between middle and lower block is 12 N.

d

Friction between middle and upper block is 2 N.

answer is A.

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Detailed Solution

f1 maximum =0.2×10=2Nf2 maximum =0.8×20=16Nf3 maximum =0.3×30=9NSo, acceleration of the lowest block isa3=f2−f31=4.5ms−2Acceleration of upper most block isa1=f11=2ms−2
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