Question

A block of mass 2 kg is kept on a horizontal surface and is pulled with a horizontal force F. If the surface is smooth, the acceleration is $8\ \text{m s}^{-2}$. If the surface is rough with coefficient 0.25, acceleration is: (g = $10\ \text{m s}^{-2}$)}

• A. 5.5 m s$^{-2}$
• B. 6.5 m s$^{-2}$
• C. 4.5 m s$^{-2}$
• D. 3.5 m s$^{-2}$

Hint:

First determine applied force in frictionless case, then subtract friction force.

Answer 1

The Correct Option is B