Question

for every 120 joules of energy input a car waste 85 joules, find the useful energy output of the car?

Answer 1

Useful Output = 35 J

Step-by-step explanation:

The useful energy output of the car must be equal to the difference between the total input energy supplied to the car and the energy wasted by the car:

Useful Output = Total Input - Waste

where,

Total Input = 120 J

Waste = 85 J

Therefore,

Useful Output = 120 J - 85 J

Useful Output = 35 J