Question

 A car of mass 800 kg is running at a constant speed of 20 m/s. Calculate its kinetic energy.​

Answer 1

Answer:

8000 J

Explanation:

Kinetic Energy = 0.5 × 800 kg × 20 m/s^2

                         = 8000 J

Answer 2

Question :

A car of mass 800 kg is running at a constant speed of 20 m/s Calculate its kinetic energy.​

So we have :

• Mass of car (m) = 800 kg
• Speed of car (v) = 20 m/s

We have to find kinetic energy of car :

⇔ Kinetic Energy (K.E.) = 1/2 * m * v²

Putting vaIues in formuIa :

⇒ K.E. = 1/2 * 800 * (20)²

⇒ K.E. = 400 * 400

⇒ K.E. = 160,000 J

⇒ K.E. = (160,000/1000) Kj

⇒ K.E. = 160 Kj

Therefore,

Kinetic energy of car = 160,000 J/ 160 Kj