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

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

Explanation:

Using the formula:

`K.E = (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 = (1)/(2) \cdot 600 \cdot 12^2`

⇒
`K.E = (1)/(2) \cdot 600 \cdot 144`

⇒
`K.E = (1)/(2) \cdot 86400`

Simplify:

⇒
`K.E = 43,200` kgm/s

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

Answer 2

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.