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xxTIMURxx [149]
3 years ago
6

Which of the following is a FALSE statement about acceleration? A. Acceleration can be zero, positive, or negative. B. An object

can have acceleration with zero velocity. C. An object can have acceleration with negative velocity. D. Acceleration is always in the same direction as velocity.
Physics
1 answer:
olchik [2.2K]3 years ago
6 0
<h3><u>Answer</u>;</h3>

C. An object can have acceleration with negative velocity.

<h3><u>Explanation</u>;</h3>
  • Acceleration is a measure of the change in velocity over time. The change in velocity is measured in meter per second (m/s), and time interval is measured in second (s).
  • Therefore, acceleration measures the change in meters per second every second [(m/s)/s], namely meters per second per second or meters per second squared (m/s2).
  • If an object has zero acceleration, its velocity doesn’t have to be zero. Acceleration is a measure of the change in velocity over time. Zero acceleration means there is no change in velocity over time, namely constant velocity.
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Answer:

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Explanation:

Given data:

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a. from kinematic eqaution of motion we have

y = Vi\times t + (\frac{1}{2}) a\times t^2

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           Vi = 0  as this relation  is for vertical motion, so the 27.0 m/s is not included

and a = 2.79 m/s^2.

Solving for t we get

t = 10.54 sec

b.

we know that V = \frac{d}{t}

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v = u + at

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v = 29.4066 m/a

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2 years ago
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