A Projectile Is Fired from Point 0 at the Edge

question 49

Short Answer

A projectile is fired from point 0 at the edge of a cliff, with initial velocity components of and , as shown in the figure. The projectile rises and then falls into the sea at point P. The time of flight of the projectile is 40.0 s, and it experiences no appreciable air resistance in flight. What is the magnitude of the velocity of the projectile 21.0 s after it is fired?

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Definitions:

Sleep Spindles

Short bursts of brain waves at a frequency of 11-16 hertz seen on an EEG, associated with stage 2 sleep and thought to be related to learning and memory consolidation.

Narcolepsy

A neurological disorder that affects the control of sleep and wakefulness, characterized by excessive daytime sleepiness and sudden sleep attacks.

Sleep Apnea

A sleep disorder characterized by pauses in breathing or periods of shallow breathing during sleep, which can lead to health problems.

Stage 4 Sleep

A deep stage of sleep characterized by delta brain waves; it is a period of restorative sleep.