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:

Unilateral Promise

A pledge or commitment by one party to perform an act without requiring a reciprocal promise from another party.

Consideration

Something of value that is exchanged between parties in a contract, which is necessary for the agreement to be legally binding.

Performance

The action or process of carrying out or accomplishing an action, task, or function.

Oral Contract

An agreement made through spoken words rather than written, which can be legally binding under certain conditions.