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sveta [45]
2 years ago
11

Which of the following has zero acceleration? an object...

Physics
1 answer:
tangare [24]2 years ago
8 0

Answer:

B object at rest

Explanation:

object at rest means it wouldn't be moving, like a parked car or sleeping person therefore, B is the correct answer

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In order to determine the required force to stop the car, proceed as follow:

Calculate the deceleration of the car, by using the following formula:

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where,

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vo: initial speed = 36m/s

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Solve the equation above for a, replace the values of the other parameters and simplify:

\begin{gathered} a=\frac{v^2_o-v^2}{2x} \\ a=\frac{(36\frac{m}{s})^2-(0\frac{m}{s})^2}{2(980m)}=0.66\frac{m}{s^2} \end{gathered}

Next, consider that the formula for the force is:

F=ma

where,

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Replace the previous values and simplify:

F=(820kg)(0.66\frac{m}{s^2})=542.20N

Hence, the required force to stop the car is 542.20N

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