Question

A block of mass $m=5kg$ is resting on a rough horizontal surface for which the coefficient of friction is $0.2$ when force $F=40N$ is applied$.$ The acceleration of the block will be $(g=10m/s)$

• A. $3m/s^2$
• B. $2m/s^2$
• C. $6m/s^2$
• D. $\frac{8}{3}m/s^2$

Answer 1

The correct option is C $6m/s^2$

Mass of block $=5kg$
$F=40N$
$\mu =0.2$
$g=10m/s²$
friction, f = μmg = 0.2×5×10 = 10N
net force $=F-f=40-10=30N$
acceleration $30/5=6m/s^2$

Hence,

option $\left(C\right)$ is correct answer.