An eraser weighing 2N is pressed against the black board with a force of 5N. The coefficient of friction is 0.4. How much force parallel to the black board is required to slide the eraser upwards

An eraser weighing 2N is pressed against the black board with a force

1.	An eraser weighing 2N is pressed against the black board with a force of 5N. The coefficient of friction is 0.4. How much force parallel to the black board is required to slide the eraser upwards
Answer» 2N 2.8N 4N 4.8N Solution :`F^(1)=f_(s)+MG, f_(s)=mu_(s)mg`