(A) increases
(B) decreases
(C) first decreases and then increases after reaching a minimum value at optimum speed
(D) first increases and then decreases after reaching a maximum value at optimum speed
(A) increases
(B) decreases
(C) first decreases and then increases after reaching a minimum value at optimum speed
(D) first increases and then decreases after reaching a maximum value at optimum speed
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