Question

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?

Answer 1

Mass of the object is `1.25` `kg.` and its final speed is `36` `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 `F/a=15/12=5/4` or `1.25` `kg.`.

As the body is assumed to be at rest, its initial velocity `u` is `0` `m/s` and as acceleration is `12` `m/s^2`, final velocity `v` is

`v=u+at=0+12×3=36` `m/s`.