When an object accelerates, what about its motion changes?

speed changes, but not direction.

either speed or direction can change.

direction changes, but not speed.

neither speed or direction can change.

B) Either speed or direction can change

There are only two ways for you to accelerate: change your speed or change your direction—or change both. If you're not changing your speed and you're not changing your direction, then you simply cannot be accelerating—no matter how fast you're going.

alfred von schlieffen, german army chief of staff, was given instructions to devise a strategy that would be able to counter a joint attack. in december, 1905, he began circulating what later became known as the schlieffen plan. schlieffen argued that if war took place it was vital that france was speedily defeated.