Answer:
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.
The power required to stop the car along the horizontal road is 8 × 10⁵ watt.
Kinetic Energy:
It is the energy of a object or body due to its motion. It is measured in Joules (J).
Power:
It can be defined as the time rate of transfer of energy. It is measured in Watt (W).
P = E/t
Where,
P - Power =
E - Energy = 8×10⁶ J
t - time = 10 s
Put the values into the formula,
p = 8×10⁶/10
p = 8 × 10⁵ watt.
Therefore, the power required to stop the car along the horizontal road is 8 × 10⁵ watt.
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