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

Jul 31, 2018

$a = 0.9375 \frac{m}{s} ^ 2$

#### Explanation:

I tried this:

$V = \frac{J}{C}$
$J = k g {m}^{2} / {s}^{2}$
$A = \frac{C}{s}$

$\frac{5 \frac{J}{C} \cdot 4 \frac{C}{s}}{8 k g \cdot \frac{8}{3} \frac{m}{s}} =$

$\frac{20 \frac{J}{s}}{\frac{64}{3} k g \frac{m}{s}} =$

$\frac{20 k g {m}^{2} / {s}^{2} \cdot \frac{1}{s}}{\frac{64}{3} k g \frac{m}{s}} =$

$\frac{20 k g {m}^{2} / {s}^{3}}{\frac{64}{3} k g \frac{m}{s}} =$

$\frac{20 k g {m}^{2}}{s} ^ 3 \cdot \frac{3 s}{64 k g m} = 0.9375 \frac{m}{s} ^ 2$