An electric toy car with a mass of #2 kg# is powered by a motor with a voltage of #4 V# and a current supply of #2 A#. How long will it take for the toy car to accelerate from rest to #3 m/s#?
I tried this:
We can say that the power of the motor will be:
dividing both sides by the time we get:
because the toy car stars from rest (
so we get: