An electric toy car with a mass of $6 kg$ is powered by a motor with a voltage of $6 V$ and a current supply of $9 A$ . How long will it take for the toy car to accelerate from rest to $14/3 m/s$ ?

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Answer 1 · 2017-03-04T16:05:51

The time is $=1.21 s$

Mass, $m=6kg$

Velocity, $v=14/3ms^-1$

Voltage, $V=6V$

Current, $I=9A$

Power, $P=IV=6*9=54W$

Energy, $E=1/2mv^2=1/2*6*(14/3)^2=65.33J$

Energy = Power x time

$E=Pt$

$t=E/P=65.33/54=1.21s$

An electric toy car with a mass of 6 kg6 kg is powered by a motor with a voltage of 6 V6 V and a current supply of 9 A9 A. How long will it take for the toy car to accelerate from rest to 14/3 m/s14/3 m/s?