Find the value of friction forces between the blocks A and B; and between B and ground. (Take, g=10 ms-2)

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90 N, 5 N

5 N, 90 N

5 N. 75 N

0 N, 80 N

answer is D.

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Detailed Solution

Maximum force of friction between ground and B is fmax=(M+m)μg=(15+5)(0.6)(10)=120 NAs fmax>F∴ Frictional force between B and ground will be 80 Nand that between A and B is zero.

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