A Mass M Is Released from a Height 80 Cm $\mu$

question 45

Multiple Choice

A mass m is released from a height 80 cm from the right-hand side of the track shown in the diagram at right. There is only friction acting along the horizontal portion 30 cm either side of the midpoint O with a kinetic coefficient of friction of $\mu$ _k = 0.4. Determine (i) how many times does the mass m pass through the midpoint O, and (ii) how far from the midpoint does it come to rest.

• A) 6, .1 m
• B) 6, .2 m
• C) 3, .2 m
• D) 3, .1 m
• E) 1, 2 cm

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