$m = ? kg$

Classical Mechanics Level 2

$20 ~ N$ force is applied to an object(from a stable condition), then the object go 100 m in 10 seconds.

FInd the mass of the object.

1 solution

Munem Shahriar
Jan 20, 2018

We know that,

$s = ut + \frac12 at^2.$

Where $u =0$ . Let's find $a$ .

$a = \frac{2s}{t^2} = \frac{200}{100} = 2 ~ \text{m/s}^2$

Now the mass of the object is:

$F =ma$

$\implies m = \frac Fa = \frac{20}{2} = 10 ~ \text{kg}$

But using the "v= u +at" formula, accelaration is coming 1 so how is it possible?

Kumudesh Ghosh - 1 year, 1 month ago