Question

A force of 100 N acts on a body of mass 2 kg for 10 s. The change in momentum of the body is (a) 100 Ns (b) 250 Ns (c) 500 Ns (d) 1000 Ns​

Answer 1

Since we know that

F=ma

but,

$a = \frac{v - u}{t}$

so,

$f = m( \frac{v - u}{t} )$

We can write it as,

$f = \frac{mv - mu}{t}$

it means,

Force=(Change in momentum)÷time

it means,

$100 = \frac{change \: in \: momentum}{10}$

So,

Change in momentum=1000Ns

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