# An electric toy car with a mass of #6 kg# is powered by a motor with a voltage of #4 V# and a current supply of #7 A#. How long will it take for the toy car to accelerate from rest to #8/3 m/s#?

##### 1 Answer

Jul 6, 2016

#### Explanation:

Since power given by the battery is

Now, we have to consider it's kinetic energy since that's what the question is about.

So, Kinetic energy equation is

Since all the work done by the battery is considered to be converted to kinetic energy,

We have

So substitute.

Rearranging gives us the answer as I have given above.

You can simplify it further yourself.