Question

A body of mass $300g$ is at rest. What force in Newton will you have to apply to move it through $200cm$ in $10s$?

• A. Zero
• B. $12N$
• C. $1.2N$
• D. $0.012N$

Answer 1

The correct option is D $0.012N$

Given: $S=200cm=2m,u=0m/s,t=10s$

Using the formula : $S=ut+\frac{1}{2}a{t}^2$

$\Rightarrow 2=0+0.5\times a\times {10}^2$

$\Rightarrow a=0.04m/s^2$

$\underset{–}{\text{Required force:}}$

Mass of the body $m=300g=0.3kg$

From Newton's second law:

$F=ma=0.3\times 0.04=0.012N$