Which has greater kinetic energy, a car traveling at 30 km/HR or a car of half the mass traveling at 60 km/HR? a. The 60 km/HR carb. The 30 km/HR carc. Both have the same kinetic energyd. More information is needed about the distance traveled

a. The 60 km/HR car

Explanation:

Kinetic Energy: This can be defined as the energy of a body due to motion. The S. I unit of kinetic energy is Joules (J).

It can be expressed mathematically as

Ek = 1/2mv² ... Equation 1

Where Ek = kinetic energy, m = mass, v = velocity.

(i) A car travelling at 30 km/hr, with a mass of m,

Ek = 1/2 (m) (30) ²

Ek = 450m J.

(ii) A car travelling at 60 km/hr, with a mass of m/2

Ek = 1/2 (m/2) (60) ²

Ek = 900m J.

Thus, the car travelling at 60 km/hr at half mass has a greater kinetic energy to the car traveling at 30 km/hr at full mass.

The right option is a. The 60 km/HR car