Question

A truck of a mass 8000 kg and a car of mass 1000 kg are travelling at the same speed. Which one has greater kinetic energy? Why?

Answer 1

Truck hashas greater kinetic energy

Explanation:

Truck has greater kinetic energy because the mass of the truck is grater than car.

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Answer 2

Given:

The mass of truck, m1 = 8000 kg

The mass of car, m2 = 1000 kg

The velocity of both truck and car is the same, i.e. v.

To Find:

Which one has greater kinetic energy?

Calculation:

- Kinetic Energy of truck is given as:

K1 = 1/2 m1 v²

⇒ K1 = 1/2 × 8000 × v²

⇒ K1 = 4000v²

- Kinetic Energy of car is given as:

K2 = 1/2 m2 v²

⇒ K2 = 1/2 × 1000 × v²

⇒ K2 = 500v²

- Clearly, K1 > K2.

- So, the Truck has greater kinetic energy due to its greater mass.