An electric toy car with a mass of $3 kg$ is powered by a motor with a voltage of $9 V$ and a current supply of $3 A$ . How long will it take for the toy car to accelerate from rest to $8/3 m/s$ ?

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Answer 1 · 2017-05-17T15:33:10

The time is $=0.4s$

Voltage is $U=9V$

Current is $I=3A$

The power of the motor is

$P=UI=9*3=27W$

Velocity is $v=8/3ms^-1$

Mass is $m=3kg$

The kinetic energy of the car is

$KE=1/2mv^2=1/2*3*(8/3)^2=32/3J$

But,

$E=P*t$

The time is $t=(32/3)/27=0.4s$

An electric toy car with a mass of 3 kg3 kg is powered by a motor with a voltage of 9 V9 V and a current supply of 3 A3 A. How long will it take for the toy car to accelerate from rest to 8/3 m/s8/3 m/s?