# An electric toy car with a mass of #7 kg# is powered by a motor with a voltage of #3 V# and a current supply of #9 A#. How long will it take for the toy car to accelerate from rest to #14/3 m/s#?

The power input is the product of the voltage and the current.

The change in kinetic energy for the car is

Thus, the time needed is the energy divided by the power.

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( t = \frac{m \cdot v}{F} = \frac{7 , \text{kg} \cdot \frac{14}{3} , \text{m/s}}{3 , \text{V} \cdot 9 , \text{A}} )

( t \approx 0.54 , \text{s} )

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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