Question

A radio-controlled car increases its kinetic energy from 3 J to 10 J over a distance of 1 m. What was the average net force on the car during this interval?

Answer 1

Net force, F = 7 N

Step-by-step explanation:

It is given that,

Initial kinetic energy of the car,
`K_i=3\ J`

Final kinetic energy of the car,
`K_f=10\ J`

Distance, d = 1 m

We need to find the average net force on the car during this interval. It is given by using the work energy theorem as :

`W=\Delta K`

`W=K_f-K_i`

Also, W = F.d d = distance and F = net force

`F.d=K_f-K_i`

`F=(K_f-K_i)/(d)`

`F=(10\ J-3\ J)/(1\ m)`

F = 7 Newton

So, the average net force on the car during this interval is 7 newton. Hence, this is the required solution.