An electric toy car with a mass of $2 kg$ is powered by a motor with a voltage of $12 V$ and a current supply of $6 A$ . How long will it take for the toy car to accelerate from rest to $4/5 m/s$ ?

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Answer 1 · 2017-05-02T06:32:10

The time is $=0.009s$

Voltage is $U=12V$

Current is $I=6A$

The power is

$P=UI=12*6=72W$

Velocity is $v=4/5ms^-1$

Mass is $m=2kg$

The kinetic energy is

$KE=1/2mv^2=1/2*2*(4/5)^2=16/25J$

But,

$E=P*t$

The time is $t=E/P=(16/25)/72=0.009s$

An electric toy car with a mass of 2 kg2 kg is powered by a motor with a voltage of 12 V12 V and a current supply of 6 A6 A. How long will it take for the toy car to accelerate from rest to 4/5 m/s4/5 m/s?