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

---

Definitions:

Cork Cambium

A lateral meristem that produces cork cells and cork parenchyma; cork cambium and the tissues it produces make up the periderm (outer bark) of a woody plant. Compare with vascular cambium.

Secondary Xylem

The part of a plant that contributes to wood formation, resulting from the division of cambium cells and providing structural support and water transport.

Cork Cells

Specialized cells in the bark of a plant that are dead at maturity and serve to protect and waterproof the plant.

Collenchyma

Living cells with moderately but unevenly thickened primary cell walls; collenchyma cells help support the herbaceous plant body.