Question

A body of mass $2kg$ is placed on a horizontal surface having kinetic friction $0\cdot 4$ and satic friction $0\cdot 5$. If the force applied on the body is $20N$, the acceleartion body will be

• A. $6m/s^2$
• B. $5m/s^2$
• C. $8\cdot 75m/s^2$
• D. $10m/s^2$

Answer 1

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

Draw a free body diagram of the given problem.

Find acceleration of the body.
Applied fore $F=20N$
mass $m=2kg$
$\mu =0\cdot 5,{\mu }_k=0\cdot 4$
Friction force
$f={\mu }_{k}N=0\cdot 4\times 2\times 10=8N$
Acceleration
$\alpha =\frac{20-8}{2}m/s^2=6m/s^2$
Final Answer:$\left(b\right)$