Question

A block of mass 2 kg is placed on the surface of a trolley of mass 20 kg which is on a smooth surface. The coefficient of friction between the block and the surface of the trolley is 0.25. If a horizontal force of 2 N acts on the block, the acceleration of the system in $m{{s}^{-2}}$ is $(g=10m{{s}^{-2}})$

• A. 1.8
• B. 1
• C. 0.9
• D. 0.09

Answer 1

Answer: (D)

0.09

Answer 2

The force of limiting friction between the block and trolley ${{f}_{L}}=\mu R=\mu mg$ $=0.25\times 2\times 10=5N$ Since, $ F=2N,F