Suppose you are assigned to stop a block which is moving eastwards, a force of some magnitude is surely required to stop it. What could be the best possible direction of a force to stop that moving block from motion at the earliest?

Since the block is moving eastwards, so a force of certain magnitude acting westwards would be the best possible direction to stop the box in minimum time. From here we conclude that force is a physical quantity whose description requires both magnitude and direction in which it acts.We cannot say about the effect of a force without knowing its direction.

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