A Heavy Rock and a Light Rock Are Dropped from the Same

question 173

Multiple Choice

A heavy rock and a light rock are dropped from the same height.The forces exerted on them by air are negligible.Which of the following statements about these rocks are correct? (There could be more than one correct choice.)

• A)Both rocks have the same kinetic energy when they reach the ground.
• B)Both rocks have the same speed when they reach the ground.
• C)The heavier rock reaches the ground before the lighter rock.
• D)Just as they were released, the two systems consisting of each rock and Earth had the same amount of gravitational potential energy.
• E)When they reach the ground, the heavier rock has more kinetic energy than the lighter rock.

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Definitions:

Ectoderm

The outermost layer of cells or tissue of an embryo in early development, which gives rise to the central nervous system, skin, and other structures.

Endoderm

The innermost layer of cells or tissue of an embryo in early development, which gives rise to the lining of some internal structures like the gut.

Blastocyst

An early stage of embryonic development characterized by a sphere of cells enclosing a fluid-filled cavity and the inner cell mass that will develop into the embryo.

Embryonic Disk

A key structure in early embryonic development from which the embryo forms, consisting of a flat, circular layer of cells.