Question

A block A of mass 200 kg rests on a block B of mass 300 kg. A is tied with a horizontal string to a wall. Coefficient of friction between A and B is 0.25 and that between B and floor is 0.2. The horizontal force F needed to move the block B is $(g=10m{s}^{-2})$.

• A. 550 N
• B. 1100 N
• C. 1500 N
• D. 2200 N

Answer 1

The correct option is C

1500 N

The horizontal force F needed to move the block B

= 0.25 (200g) + (0.2) (500 g) = 1500 N.