Question

An electric toy car with a mass of `4 kg` is powered by a motor with a voltage of `12 V` and a current supply of `3 A`. How long will it take for the toy car to accelerate from rest to `5 m/s`?

Answer 1

`=1.39s`

Explanation:

By conservation of energy
Electrical energy spent = KE of train

`VxxIxxt=1/2xxmxxv^2`
`=>12xx3xxt=1/2xx4xx5^2`
`t = 50/36=1.39s`