Imagine two identical grocery carts, each with wheels that roll smoothly. One cart is empty. The other is filled with groceries, which have a total mass of 10 kg. Which would be more difficult to push from rest to a speed of 2 m/s? (That is, which would require greater force, or a longer time to push, to see the same change in motion?)    A.the empty cart the filled cart        B.both would require the same effort  C.Once both carts are moving at 2 m/s, they each roll with almost no friction.     Which of the following is true?  A.The filled cart requires a force to keep moving, while the empty cart continues to move at the same speed.  B.The empty cart requires a force to keep moving, while the filled cart continues to move at the same speed.        C.Both carts will require the same force to keep moving, otherwise they will both nearly immediately come to a stop.  D.Both carts continue to roll at about the same speed. No applied force is necessary.

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.