Question

The change in momentum of a vehicle weighing 2000 kg when its speed increases from 36 km/h to 72 km/h uniformly is :

• A. 15000 kg.m/s
• B. 4000 kg.m/s
• C. 20000 kg.m/s
• D. 7200 kg.m/s

Answer 1

Answer: (C)

20000 kg.m/s

Given : $m=2000$ kg $u=36$ km/h $=36\times \frac{5}{18}=10$ m/s $v=72$ km/h $=72\times \frac{5}{18}=20$ m/s

Change in momentum $\Delta P=m(v-u)=2000\times (20-10)=20000$ kg.m/s