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Q.

An iron block of dimensions 5 cm x 10 cm x 15 cm has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is

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a

(10 cm x 5 cm) surface

b

Force is same for all surfaces

c

(5 cm x 15 cm) surface

d

(10 cm x15 cm) surface 

answer is D.

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Detailed Solution

Force is same for all surfaces

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