The power is defined as the work done (W) by the transmission per unit of time (t) to accelerate the train:

To find the work done, we can use the work-energy theorem, which states that the work done is equal to the variation of kinetic energy of the train. Since the trains starts from rest, its initial kinetic energy is zero, so the work done is simply equal to the final kinetic energy:

where m is the mass of the train and

is its final velocity.

The mass of the train is m=0.875 kg while its final velocity is

, the work done by the electrical transmission is

And since this work is done in a time of t=20.5 ms=0.0205 s, the minimum power delivered is

**Answer:**

The answers to the questions are

1. Sound <u>e</u>nergy

2. Co<u>n</u>ductor

3. Flow

4. Thermal ener<u>g</u>y (g underlined)

5. Elect<u>r</u>ic current

6. Insulator

7. Light energ<u>y</u>

8. El<u>e</u>ctric circuit

The underlined letters are, e, n, g, r, y, e which can be rearranged to spell energy

**Explanation:**

1. Sound energy is the wave form of mechanical energy that is transferred by the vibration of the of the medium through which it propagates

2. An electrical conductor is used to conduct electricity from one point to another

3. An object or material flows when it has a smooth motion towards a given direction, such as a river

4. Thermal ener<u>g</u>y is the form of energy that is given off by a body as sensible heat that can be measured as a temperature by a thermometer

5. Electric current is the electricity in a circuit

6. An insulator is a material that limits the flow of electricity or heat

7. Light energy is the form electromagnetic energy which the eye can sense

8. An electric current flows an electric circuit which consist of a source of electricity and an path through which the electric current can easily flow.

**Answer:**

<h2>

**False**</h2>

**Explanation:**

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The SI / Metric unit of force is the ' **Newton** '.

1 newton is the force that accelerates 1 kg of mass at the rate of 1 m/s² .