Question

The diagram represents the movement of a train from left to right, with velocity v. Which statement is true? A) The train is speeding up. B) The train is slowing down. C) The train is moving at a constant speed. D) The train is speeding up in certain intervals while decreasing in others. Submit

Answer 1

B.

The velocity vector decreased in size. A decrease in the size of the vector corresponds to a decrease in the magnitude of the vector. This means that the correct answer choice is The train is slowing down. An increase in the size of the vector corresponds to an increase in the magnitude of the vector or speeding up. A constant speed would maintain the size of the vector.

Answer 2

As we can see the figure it is showing the velocity vector at different positions of the train

Here we know that magnitude of the vector is given by the length of the vector

So we know from the figure that as we move from left to right the length of vector is keep on decreasing

This shows that velocity of the train is keep on decreasing from left to right

So the correct answer here is

B) The train is slowing down.