Question

A car of mass 500kg is moving with a velocity of 54 km/h. What is its kinetic energy?
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Answer 1

Answer:

56250 joules.

Explanation:

mass of the car = 500kg.

velocity = 54km/h = 15m/sec

by applying the foemula of kinetic energy,

K.E = 1/2 mv²

K.E = 1/2 × 500 × 15²

= 56250 j

Answer 2

Given:

Mass of the car (M) $= 500 kg$

Velocity of the car (v) $= 54 km/h$

To find:

Kinetic energy of the car.

Explanation:

• Kinetic energy is the energy possessed by or because of the virtue of velocity by an object.

        Mathematically, Kinetic energy = $\frac{1}{2}mv^{2}$

• For example, a bullet fired by a pistol has a great amount of velocity and thus, this velocity determines the amount of energy it carries.
• As we know energy is always conserved, for example a car running on road has already spent energy on burning of fuel to move the car thus, the car has gained this much speed and again has to spend energy on stopping the car.

Solution :

For calculating the kinetic energy of the car,

$v = 54 km/h$

  $= 15 m/s$

Substituting the given values in the equation, we get

$K.E. =$ $\frac{1}{2}(500)(15)^{2}$  ; or

$K.E. = 56250 J\\K.E. = 56.25 KJ$

Final answer:

Hence, the K.E. of the car will be $56250 J or 56.25 KJ$ .