An Object with a Mass M = 250 G Is $\theta$

question 37

Multiple Choice

An object with a mass M = 250 g is at rest on a plane that makes an angle $\theta$ = 30 ^o above the horizontal. The coefficient of kinetic friction between M and the plane is µ_k = 0.100. Mass M is attached by a string to another mass, m = 200 g, which hangs freely. When mass m has fallen 30.0 cm, its speed is

• A) 83 cm/s.
• B) 48 cm/s.
• C) 160 cm/s.
• D) 59 cm/s.
• E) 72 cm/s.

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