A Girl Throws a Stone from a Bridge

A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case.
Case A: Thrown straight up.
Case B: Thrown straight down.
Case C: Thrown out at an angle of 45° above horizontal.
Case D: Thrown straight out horizontally.
In which case will the speed of the stone be greatest when it hits the water below if there is no
Significant air resistance?

A) Case A
B) Case B
C) Case C
D) Case D
E) The speed will be the same in all cases.

Correct Answer:

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