An electric toy car with a mass of $5 kg$ is powered by a motor with a voltage of $12 V$ and a current supply of $1 A$ . How long will it take for the toy car to accelerate from rest to $3 m/s$ ?

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Answer 1 · 2016-03-19T15:58:37

$t=1.875s$

let the time taken be t s
Then electrical energy spent during this time $V*I*t$
Rhis energy will be equal to the KE gained= $1/2mv^2$

$V*I*t=1/2*m*v^2$
$12*1*t=1/2*5*3^2$
$t=45/24=15/8=1.875s$

An electric toy car with a mass of 5 kg5 kg is powered by a motor with a voltage of 12 V12 V and a current supply of 1 A1 A. How long will it take for the toy car to accelerate from rest to 3 m/s3 m/s?