位置與運動

物理 · 共 52 題 · 點擊選項即時核對答案

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51.

Which of the following statements concerning the motion of a body is/are correct ?

(1)A body has no acceleration when it is moving with a uniform velocity.

(2)A body can have zero velocity but also be accelerating.

(3)A body can have a constant speed but a varying velocity.

52.

A body is dropped from rest down a cliff on a planet $X$ . After falling for $1$ s, it is $4$ m below the starting point. How far below the starting point will it be after a further $4$ s ?