A 30-Kg Mass Sliding on a Frictionless Surface Explodes into Three

question 21

Multiple Choice

A 3.0-kg mass sliding on a frictionless surface explodes into three 1.0-kg masses. After the explosion the velocities of the three masses are: (1) 9.0 m/s, north; (2) 4.0 m/s, 30° south of west; and (3) 4.0 m/s, 30° south of east. What was the magnitude of the original velocity of the 3.0-kg mass?

• A) 1.7 m/s
• B) 1.0 m/s
• C) 1.3 m/s
• D) 2.0 m/s
• E) 2.8 m/s

---

Definitions:

Pride

A feeling of deep satisfaction derived from one's own achievements, the achievements of those with whom one is closely associated, or from qualities or possessions that are widely admired.

Disgust

A feeling of intense disgust or aversion triggered by something seen as repulsive or disagreeable.

Joy

Joy is a feeling of great pleasure and happiness, often arising from a sense of well-being or fulfillment.

Prefrontal Cortex

The part of the brain located at the front of the frontal lobe, associated with complex cognitive behavior, personality expression, decision making, and moderating social behavior.