A Ball Is Projected Upward at Time T = 0 $58.5 \mathrm {~m} / \mathrm { s }$

question 65

Multiple Choice

A ball is projected upward at time t = 0 s,from a point on a flat roof 10 m above the ground.The ball rises and then falls,missing the roof,and strikes the ground.The initial velocity of the ball is $58.5 \mathrm {~m} / \mathrm { s }$ Consider all quantities as positive in the upward direction.Neglect the effects of air.At time $t = 5.97 \mathrm {~s} ,$ the vertical velocity of the ball is closest to

• A)0 m/s.
• B)+175 m/s.
• C)+12 m/s.
• D)-175 m/s.
• E)-12 m/s.

---

Definitions:

Working Memory

An intellectual mechanism with finite space, dedicated to briefly storing data for further manipulation.

Echoic Memory

A subtype of sensory memory that retains auditory information for a short period after the original sound is heard.

Fleeting Memory

A brief or rapidly fading memory, often unable to be recalled after a short period of time.

Paying Attention

The act of focusing cognitive resources on a particular stimulus or task, while filtering out distractions.