Question

A body of mass 2 kg moves with an acceleration of 3 ms-2. Calculate the change in momentum in one second

Answer 1

Force is change in momentum per unit time.

So multiplying force with time gives change in momentum.

m= 2kg

a= 3m/s^2

t = 1sec

therefore, f = md

so, f*t = m*a*t

i.e. 2*3*1

= 6kgm/s

Answer 2

$\textbf{ \blue{ Hello Mate! }}$

$\textbf{ \large{ p = mv }}$

Initial Momentum (p) = mu
= 2u

Final Momentum = 2v

$a = \frac{v - u}{t} \\ a \times 1 = v - u \\ 3 = v - u$

Change in momentum = Final p - Initial p
= 2v - 2u
= 2( v - u )
= 2( 3 ) = 6 kg m/s

$\boxed{ \textsf{ \red{ Change\:in\:momentum\:is\:6\:kg\:m/s }}}$

Have great future ahead!