An electric toy car with a mass of $2 kg$ is powered by a motor with a voltage of $1 V$ and a current supply of $6 A$ . How long will it take for the toy car to accelerate from rest to $6 m/s$ ?

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Answer 1 · 2017-07-18T05:35:44

The time is $=6s$

The power is

$P=UI$

The voltage is $U=1V$

The current is $I=6A$

The power is

$P=UI=1*6=6W$

The kinetic energy of the car is

$E=1/2mv^2$

The mass is $m=2kg$

The speed is $v=6ms^-1$

so,

$E=1/2*2*(6)^2=36J$

Let the time $=ts$

$E=Pt$

$t=E/P=36/6=6s$

An electric toy car with a mass of 2 kg2 kg is powered by a motor with a voltage of 1 V1 V and a current supply of 6 A6 A. How long will it take for the toy car to accelerate from rest to 6 m/s6 m/s?