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An iron block of sides 5 cm xx 8 cm xx 1...

An iron block of sides `5 cm xx 8 cm xx 15 cm` has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is

A

`8 cm xx 15 cm` surface

B

`8 cm xx 5 cm` surface

C

`5 cm xx 15 cm` surface

D

force is the same for all surfaces

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