Question

A force of $6N$ acts on a body at rest of mass $1kg$. During this time, the body attains a velocity of $30m/s$. The time for which the force acts on the body is:

• A. $10s$
• B. $8s$
• C. $7s$
• D. $5s$

Answer 1

The correct option is D $5s$

$F=\frac{\Delta P}{\Delta t}=\frac{m(V_2-V_1)}{\Delta t}=\frac{1(30-0)}{\Delta t}=6$
$\Delta t=\frac{30}{6}=5s$