APFIVE Acceleration on a Frictionless Incline
A block of mass m slides down a frictionless inclined plane making an angle θ with the horizontal. Which expression correctly describes the condition for the block’s velocity to increase?
A
The angle θ must be increasing with time
B
mg sin θ > 0
C
The normal force must be decreasing
D
mg cos θ > mg sin θ
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