Question

a truck of mass 1000 kg, increases its speed from 36 km h -1 to 72 km h-1. find the increase is its kinetic energy

Answer 1

Answer:

5,000j kinetic energy increases

Explanation:

increase in kinetic energy=1/2mv^2 - 1/2mu^2

v=72km/h=20m/s

u=36km/h=10m/s

m=1000kg

1/2mv^2-1/2mu^2

1/2*1000*20-1/2*1000*10

10,000-5,000

5000j