A Ball Is Projected Upward at Time T = 0

question 14

Multiple Choice

A ball is projected upward at time t = 0.00 s, from a point on a roof 70 m above the ground and experiences negligible air resistance. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 28.5 m/s. Consider all quantities as positive in the upward direction. The velocity of the ball when it is 39 m above the ground is closest to

• A) -38 m/s.
• B) -30 m/s.
• C) -23 m/s.
• D) -15 m/s.
• E) -45 m/s.

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Definitions:

Neuron

A nerve cell that is the basic building block of the nervous system, responsible for transmitting information throughout the body.

Infant Brain

The developing brain of a child from birth to around the age of three years, which undergoes rapid growth and development.

Adult Weight

The weight or body mass of an individual after reaching full physical maturation, often used in health and medical assessments to evaluate well-being and lifestyle risks.

Myelination

The process of forming a myelin sheath around the axons of neurons, which speeds up the transmission of electrical signals in the nervous system.