A body of mass 10 kg is slipping on a rough horizontal plane and moves with a de

Question

A body of mass 10

k g

is slipping on a rough horizontal plane and moves with a deceleration of 4.0

m / s^{2}

What is the magnitude of frictional force?

Options:

A . 40 N

B . 20 N

C . 100 N

D . Data insufficient (require coefficient of kinetic friction)

Answer: Option A
:
A

f_{r}

=ma

f_{r}

= 10 x 4 kg-m/

s^{2}

f_{r}

= 40 N
As friction can be the only external force acting of the body in horizontal direction.

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