Question

An electric toy car with a mass of `3 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 `14/3 m/s`?

Answer 1

`4.083s`

Explanation:

Conservation of energy - Electrical energy supplied to the toy car equals gain in mechanical kinetic energy of the toy car.

`therefore VIt=1/2mv^2`

`t=(1/2xx3xx(14/3)^2)/(4xx2)`

`=4.083s`.