Question

Answer the following briefly. In problem solving please show your solution.

Answer 1

We will have the following:

1. We can see it because super heated plasma liberates light, and human being as many other creatures can detect visible light.

2. We know that the relationship between wavelength, frequency and speed is given by the expression:

`\lambda=(v)/(f)`

So, wavelength is proportional to the velocity and inversely proportional to the frequency.

3. The average speed is:

`v=(250km)/(5h)\Rightarrow v=(50mk)/(h)`

So, the average velocity is 50 km/h.

4. The acceleration is:

`a=(20m/s-25m/s)/(4s)\Rightarrow a=-1.25m/s^2`

So, the acceleration was of -1.25 m/s^2.