Question

A stationary bus of mass 5000kg gets velocity of 90kmph ,then the change in momentum of bus is ______

Answer 1

$\huge{\bold{\underline{\underline{Solution:-}}}}$

$\large{\underline{To Find}}$

Change in momentum = ?.

I.e. ${ \triangle p }$ = ?.

$\large{\bold{\underline{\underline{Step - by - Step - Explanation}}}}$

As the velocity is given in km/h it needs to be converted to m/s.

${90\: km/h = 90 \times \frac{5}{18}\: m/s}$

So,velocity becomes

${v = 25 \:m/s}$

It is given:-

• u = 0 m/s.
• v = 25 m/s.
• m = 5000 kg.

${ \triangle p = mv - mu}$

as u = 0 the equation becomes.

${ \triangle p = mv}$

${ \triangle p = 5000 \times 25 }$

${ \triangle p = 1,25,000 kgm/s}$

$\huge{\boxed{\boxed{ \triangle p = 1,25,000 kgm/s}}}$

So,the change in momentum of bus is 1,25,000 kgm/s.