Ignoring air resistance and the little friction from the plastic tube, the magnet was a freely-falling object in each trial. If a freely-falling object is travelling twice as fast after it has fallen 40 m than after falling 10 m, what do you predict the maximum emf would be if you drop the magnet through the same coil from a height of 40 cm? Explain your answer.

emf will also be 10 times less as compared to when it has fallen

Explanation:

We know, from faraday's law-

and

So, as the height increases the velocity with which it will cross the ring will also increase.

Given

Now, from

From equation a and b we see that velocity when dropped from is 10 times greater when height is 40 so, emf will also be 10 times less as compared to when it has fallen

uranium fissions/breaks up giving out energy and neutrons