An electric toy car with a mass of $4 kg$ is powered by a motor with a voltage of $7 V$ and a current supply of $1 A$ . How long will it take for the toy car to accelerate from rest to $3/2 m/s$ ?

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Answer 1 · 2016-06-18T02:45:20

$=9/14s$

Given

Now assuming there is no loss of energy due to friction etc, we can apply conservation of energy to solve the problem.

$Now Power P = IxxV$

$"Electrical work done"="Gain in KE"$

$=>Pxxt=1/2xxmxxv^2$

$=>IxxVxxt=1/2xxmxxv^2$

$=>1xx7xxt=1/2xx4xx(3/2)^2$

$=>t =9/14s$

An electric toy car with a mass of 4 kg4 kg is powered by a motor with a voltage of 7 V7 V and a current supply of 1 A1 A. How long will it take for the toy car to accelerate from rest to 3/2 m/s3/2 m/s?