A Toy Rocket Is Launched Vertically from Ground Level at Time

question 17

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 81 m and acquired an upward velocity of $40 \mathrm{~m} / \mathrm{s}$ The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The upward acceleration of the rocket during the burn phase is closest to

• A) 9.9 m/ \( \mathrm{s}^{2} \).
• B) 9.6 m/ \( \mathrm{s}^{2} \) .
• C) 9.3 m/ \( \mathrm{s}^{2} \) .
• D) 9.0 m/ \( \mathrm{s}^{2} \) .
• E) 8.7 m/ \( \mathrm{s}^{2} \) .

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Definitions:

McDougall

A psychologist known for his contributions to the field of social psychology and the concept of instinct theory.

Instinct

Innate drive or impulse, genetically transmitted.

Attachments

Emotional bonds formed between individuals, crucial for personal development and influencing later relationships.

Reconciliation

The process of restoring friendly relations or making one's beliefs or actions consistent with another.