The kinetic energy of a car is 8 * 106 J as it travels along a horizontal road. How much power is required to stop the car in 10 s?

The power required to stop the car = 8 * 10⁵ watt.

Explanation:

Kinetic Energy: This is the energy of a body in motion. The S. I unit of energy is Joules (J).

Power: These is defined as time rate of doing work, or it can be defined as the time rate of transfer of energy. The S. I unit of power is Watt (W).

Mathematically, power can be expressed as

Power = Energy/time

P = E/t ... Equation 1

Given: E = 8*10⁶ J, t = 10 s

Substituting these values into equation 1,

p = 8*10⁶/10

p = 8 * 10⁵ watt.

Therefore the power required to stop the car = 8 * 10⁵ watt.