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

question 51

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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