Question

What is the kinetic energy of a 1400 kg car traveling at a speed of 30 m/s (≈65mph)?

Answer 1

$\frac{1 }{2} m {v}^{2}$
kinetic energy equation.

630,000J

Answer 2

Answer:

Kinetic Energy (K.E) of the car is 630000 J

Explanation:

Kinetic energy (K.E) of a body is the energy of the body in motion and it is given by the product of half its mass (m) and the square of its velocity (v). It is expressed in Joules.

Mathematically written as;

K.E = $\frac{1}{2}$ x m x $v^{2}$

According to the question,

The mass m of the car is 1400kg

=> m = 1400kg

The speed (velocity) of the car is 30m/s

=> v = 30m/s

Substituting these values into the equation above gives;

K.E = $\frac{1}{2}$ x 1400 x $30^{2}$

K.E = 630000 J

Therefore the kinetic energy of the car is 630000Joules