Give reasons for the following:

A horse and a dog are running with the same speed. Which one of them has more kinetic energy than the other?

Give reasons for the following:

A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.

Is it practically possible to convert a form of energy completely into another useful form? Give reason.

In a shopping mall, while standing on an escalator you move from level 1 to 30 metre high level 4. What is the work done by you?