a carnival is marching into sand. If the rows marched straight towards the
sand, and not at an angle, what would happen to their speed and direction
Answers
Imagine you were on a beach and had to reach somebody in the water. You could run to the nearest point of the water and swim diagonally, but assuming you swim slower than you run, this would take the most time. Or you could run all the way along the beach to the closest point to the person and swim the shortest distance but this is still a longer than necessary path.
But there is a point on the beach where if you ran to that point then swam, you would minimise the total time taken. The point would depend only on the ratio of your speed running and swimming. This is exactly what light does. It's called Fermat's principle and is one of the most fundamental things in physics.
Answer:
THEIR SPEED IS DISBALENCED
AND THEIR DIRECTIONS MAY CHANGE
Explanation: