Question

a car is moving at 12 m/s and has a mass of 600 kg. what is the kinetic energy of the car? a)36,300 b)42,200 c)72,600 d)86,400

Answer 1

Formula of Kinetic energy:

ke = 1/2 * mass * velocity²

mass = 600 kg
velocity = 12m/s

ke = 1/2 * 600 * (12)²
ke = 1/2 * 600 * 144
ke = 1/2 * 86,400
ke = 43,200

The kinetic energy of the moving car is 43,200 joules.

Answer 2

Answer:

The kinetic energy of the car is, 43,200 kgm/s

Step-by-step explanation:

Using the formula:

$K.E = \frac{1}{2}mv^2$           ....[1]

where,

K.E is the Kinetic Energy

m is the mass

and v is the velocity.

As per the statement:

a car is moving at 12 m/s and has a mass of 600 kg.

⇒m = 600kg and v = 12m/s

Substitute these given values in [1] we have;

$K.E = \frac{1}{2} \cdot 600 \cdot 12^2$

⇒$K.E = \frac{1}{2} \cdot 600 \cdot 144$

⇒$K.E = \frac{1}{2} \cdot 86400$

Simplify:

⇒$K.E = 43,200$ kgm/s

Therefore, the kinetic energy of the car is, 43,200 kgm/s