F=ma 2024 Problem 08

Physics · mechanics

Problem

Question: As shown in the figure, a rod of length

L

is sliding down a frictionless wall. When the rod makes an angle of

45^{\circ}

to the horizontal, the bottom of the rod has speed

v

. At this moment, what is the speed of the middle of the rod? (A)

v/2

. (B)

v/\sqrt{2}

. (C)

v

. (D)

\sqrt{2}v

. (E)

{2v}

. *Note: This problem references figure(s): `image_question/F=MA_2024_08_1.png`*