A 15-Kg Object Sitting at Rest Is Struck Elastically in a Head-On

question 28

Multiple Choice

A 15-kg object sitting at rest is struck elastically in a head-on collision with a 12-kg object initially moving at +3.0 m/s.Find the final velocity of the 15-kg object after the collision.

• A) −1.0 m/s
• B) −3.0 m/s
• C) +5.0 m/s
• D) +3.0 m/s
• E) ​+11.0 m/s

---

Definitions:

Root Hair

An extension, or outgrowth, of a root epidermal cell. Root hairs increase the absorptive capacity of roots.

Endodermal Cell

An endodermal cell is a type of cell originating from the innermost layer of the early embryo, contributing to the formation of the lining of the digestive and respiratory systems.

Stele

The cylinder in the center of roots and stems that contains the vascular tissue; also called vascular cylinder.

Pericycle

A layer of cells found just inside the endodermis in plant roots, involved in the formation of lateral roots and secondary growth.