An electric toy car with a mass of $3 k g$ $3 kg$ is powered by a motor with a voltage of $4 V$ $4 V$ and a current supply of $2 A$ $2 A$ . How long will it take for the toy car to accelerate from rest to $\frac{14}{3} \frac{m}{s}$ $14/3 m/s$ ?

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Answer 1 · 2016-07-30T15:59:30

$4.083 s$ $4.083s$

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

$therefore VIt=1/2mv^2$

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

$=4.083s$ .

An electric toy car with a mass of 3 kg3kg3 kg is powered by a motor with a voltage of 4 V4V4 V and a current supply of 2 A2A2 A. How long will it take for the toy car to accelerate from rest to 14/3 m/s143ms14/3 m/s?