Question

an electric car is being driven through a town at 22m/s the kinetic energy of the car is 222640 J calculate the mass of the car

Answer 1

The mass of the car at the given kinetic energy is 920 kg.

The given parameters;

• initial velocity of the car, u = 22 m/s
• kinetic energy of the car, K.E = 222,640 J

Kinetic energy if the energy acquired by a body during its motion. This kinetic energy is the product of average velocity squared and mass of the object.

The mass of the car at the given kinetic energy is calculated as follows;

$K.E = \frac{1}{2} mv^2\\\\mv^2 = 2K.E \\\\m = \frac{2K.E}{v^2} \\\\m = \frac{2 \times 222,640}{(22)^2} \\\\m = 920 \ kg$

Thus, the mass of the car at the given kinetic energy is 920 kg.

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