Question

What is the change in momentum of a car weighing 1000 kg when its speed increases from 72 km/h to 108 km/h uniformly?​

Answer 1

$\huge\fcolorbox{red}{cyan}{10000kg.m/s}$

Explanation:

First lets calculate the Initial Momentum :-

• Initial velocity(u) =>72km/h = 20m/s

• Mass = 1000 kg

$\color{purple}{Momentum = mass \times velocity} \\ =>20 \times 1000 \\ => \boxed{20000\:kg.m/s}$

Thus initial Momentum is 20000 kg.m/s

Now Lets Calculate the Final Momentum :-

• Final Velocity(v) =>108km/h = 30 m/s

• Mass(m) = 1000 kg

$\bf\color{lime}{Momentum=mass \times velocity} \\ =>1000 \times 30 \\ =>\boxed{30000}$

Finally :-

Change in Momentum :-

$\bf{Final\: Momentum - Initial \:Momentum} \\ => 30000 - 20000 \\ => \boxed{10000}$

hope it helped

Answer 2

Answer:

10000kgm/s

Explanation:

initial velocity =72km/h=20m/s

final velocity=108km/h=30m/s

mass=1000kg

find

change in momentum

solution

change in momentum=final momentum - initial momentum

=m*final velocity - m*initial velocity

=1000kg*30m/s-10000kg*20m/s

=10000kgm/s