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Crank
4 years ago
15

While you are driving down a country road at dusk with a velocity of 22 m/s, a deer suddenly runs across the road in front of yo

u. You apply the brakes, reducing your velocity to 7 m/s in 5 s as you avoid hitting the deer. What is the acceleration of the car?
Physics
1 answer:
juin [17]4 years ago
7 0

Answer:

a=\frac{v_{f}-v_{o}  }{t_{f}-t_{o}  } =\frac{(7-22)\frac{m}{s} }{5s-0s} =-3\frac{m}{s^{2} }

Explanation:

We know that the initial velocity is 22 m/s

<u>The final velocity </u><u>after applying the brakes</u><u> is 7 m/s, and the time that takes it to break is </u><u>5 seconds</u>

We know that the concept of acceleration is the change of velocity in time

a=\frac{v_{f}-v_{o}  }{t_{f}-t_{o}  } =\frac{(7-22)\frac{m}{s} }{5s-0s} =-3\frac{m}{s^{2} }

<u><em>The answer is negative since the car is slowing down  </em></u>

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