An electric toy car with a mass of $5 kg$ is powered by a motor with a voltage of $6 V$ and a current supply of $5 A$ . How long will it take for the toy car to accelerate from rest to $8 m/s$ ?

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Answer 1 · 2017-03-13T12:52:01

The time is $=5.33s$

The power is

$P=UI=6*5=30W$

The energy is

$E=1/2mv^2=1/2*5*8^2=160J$

But,

$E=P*t$

$t=E/P=160/30=16/3=5.33s$

An electric toy car with a mass of 5 kg5 kg is powered by a motor with a voltage of 6 V6 V and a current supply of 5 A5 A. How long will it take for the toy car to accelerate from rest to 8 m/s8 m/s?