# A force of 12 newtons is applied on an object and it gives it an acceleration of 12 m/s^2. Find the mass of the object and its velocity after 3 seconds?

Dec 12, 2016

Mass of the object is $1.25$ $k g .$ and its final speed is $36$ $\frac{m}{s}$

#### Explanation:

We assume the object is at rest. As force F=m×a, where $m$ is mass and $a$ is acceleration, both in similar units - like above we have in MKS units.

Hence, mass is $\frac{F}{a} = \frac{15}{12} = \frac{5}{4}$ or $1.25$ $k g .$.

As the body is assumed to be at rest, its initial velocity $u$ is $0$ $\frac{m}{s}$ and as acceleration is $12$ $\frac{m}{s} ^ 2$, final velocity $v$ is

v=u+at=0+12×3=36 $\frac{m}{s}$.