A duster weighs 0.5N. It is pressed against vertical board with a horizontal force of 11N. If the co-efficient of friction is 0.5 the minimum force that must be applied on the duster parallel to the board to move it upwards is

A duster weighs 0.5N. It is pressed against vertical board with a hori

1.	A duster weighs 0.5N. It is pressed against vertical board with a horizontal force of 11N. If the co-efficient of friction is 0.5 the minimum force that must be applied on the duster parallel to the board to move it upwards is
Answer» 0.4 N 0.7 N 6N 7N Solution :`F_(up)=F+mg, f=muN, N=F`