Question

A truck of mass 1200 kg increases its speed from 54km/h to 72km/h. Find the increase in its kinetic energy.

Answer 1

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Answer 2

Explanation:

mass=1200kg

v1=54km=15m/s ( divide by 10/36)

v2=72km/h=20m/s

increase=1200x1/2(400-225).

(1./2m(v2)²-1/2m(v1)²)

=1200x1/2x175.

{1/2m(v2²-v1²)}

=10500

=1.05x10⁵J answer

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