Question

How much power is used by car when it applies 40,000 J of work over a 5.6 second interval

Answer 1

Answer:

7142.86W

Explanation:

Given parameters:

Work done by brake  = 40000J

Time taken = 5.6s

Unknown:

Power used by car  = ?

Solution:

Power can be defined as the rate at which work is done. It is mathematically expressed as;

        Power = $\frac{work done }{time taken}$

Now input the variables;

           Power  = $\frac{40000}{5.6}$   = 7142.86W