block of mass 0-1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the mass is 0.5, the magnitude of the frictional force acting on the block is :

Options

A. 0.98 N
B. 0.49 N
C. 4.9 N
D. 2.5 N

Answer

a

Explanation

Force of limiting friction
`F_(f)= muR = 0.5 xx 5 = 2.5 N`
` wt. of block = mg = 0.1 xx 9.8 = 0.98N`
As weight is less than limiting friction ::. block does not move
:. Frictional force = wt. of block = 0.98 N

Hence correct choice is (a).