A Toy Rocket Is Launched Vertically from Ground Level at Time

question 55

Multiple Choice

A toy rocket is launched vertically from ground level at time t = 0.00 s.The rocket engine provides constant upward acceleration during the burn phase.At the instant of engine burnout,the rocket has risen to 64 m and acquired an upward velocity of 60 m/s. The rocket continues to rise with insignificant air resistance in unpowered flight,reaches maximum height,and falls back to the ground.The time interval during which the rocket engine provided the upward acceleration,is closest to

• A)2.1 s.
• B)2.3 s.
• C)1.9 s.
• D)1.7 s.
• E)1.5 s.

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Definitions:

Ossicle

Small bones, particularly referring to the three bones found in the middle ear: the malleus, incus, and stapes.

Otoscopy

A medical examination technique that involves looking inside the ear using an instrument called an otoscope.

Electronystagmography

A diagnostic test that records involuntary movements of the eye (nystagmus) to assess the vestibular system.

Tympanometry

A test that measures the movement of the eardrum in response to changes in air pressure, used to diagnose issues in the middle ear.