Question

A car of mass $600kg$ is moving with a speed of $10m{s}^{-1}$ while a scooter of mass $80kg$ is moving with a speed of $50m{s}^{-1}$. Which vehicle will require more force to stop it in the same interval of time?

• A. scooter
• B. car
• C. same force will be required for both
• D. insufficient data

Answer 1

Answer: (B)

car

As we know that momentum is nothing but product of mass and velocity. Let us substitute the given values.

Given that mass of the car as 600 kg and velocity as 10 m/sec.
Hence momentum of the car is $P=600\times 10=6000kgm/sec$. We have mass of the scooter as 80 kg where as velocity is 50 m/sec.
Hence momentum is $P=80\times 50=4000kgm/sec$.

As momentum of car is more we need more force to stop the car.