What is the momentum in kg.m/s of a 10 kg car travelling at (a) 5 m/s (b) 20 cm/s, and (c) 36 km/h ?


Here given, mass of the body $m=10\ kg$


(a) Velocity of the car $v=5\ m/s$

Therefore, the momentum of the car $=mv$

$=10\ kg\times5\ m/s$

$=50\ kg-m/s$

(b) Velocity of the car $v=20\ cm/s=20\times\frac{1}{100}\ m/s=0.2\ m/s$

Therefore, the momentum of the car $=mv$

$=10\ kg\times0.2\ m/s$

$=2\ kg-m/s$


(c) Velocity of the car $v=36\ km/h=36\times\frac{5}{18}\ m/s=10\ m/s$

Therefore, the momentum of the car $=mv$

$=10\ kg\times10\ m/s$

$=100\ kg-m/s$

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Updated on: 10-Oct-2022

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