An electric toy car with a mass of $3 kg$ is powered by a motor with a voltage of $4 V$ and a current supply of $8 A$ . How long will it take for the toy car to accelerate from rest to $5/3 m/s$ ?

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Answer 1 · 2017-04-13T14:04:10

The time is $=0.13s$

Voltage is $U=4V$

Current is $I=8A$

The power is

$P=UI=4*8=32W$

Velocity is $v=5/3ms^-1$

Mass is $m=3kg$

The kinetic energy is

$KE=1/2mv^2=1/2*3*(5/3)^2=25/6J$

But,

$E=P*t$

The time is $t=E/P=(25/6)/32=0.13s$

An electric toy car with a mass of 3 kg3 kg is powered by a motor with a voltage of 4 V4 V and a current supply of 8 A8 A. How long will it take for the toy car to accelerate from rest to 5/3 m/s5/3 m/s?