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balandron [24]
3 years ago
9

100 point question!! A driver begins to brake when her car is traveling at 15.0 m/s, and the car comes to a stop 4.0 s later. Ho

w much farther does the car go after the driver begins to brake, assuming constant acceleration?
Physics
1 answer:
Anni [7]3 years ago
3 0

Answer:

30 m

Explanation:

Let's list out the known variables that we are given in this question.

  • v₀ = 15 m/s
  • v = 0 m/s
  • t = 4 s

We are trying to solve for displacement in the x-direction.

  • Δx = ?

Find which constant acceleration equation contains all 4 of these variables.

  • \displaystyle \triangle x = \Big (\frac{v+v_0}{2} \Big ) t

Plug the known values into the equation and solve for delta x.

  • \displaystyle \triangle x = \Big (\frac{0+15}{2} \Big ) \cdot 4
  • \displaystyle \triangle x = \Big (\frac{15}{2} \Big ) \cdot 4  
  • \displaystyle \triangle x =\frac{60}{2}
  • \triangle x = 30

The car goes 30 m after the driver begins to brake.

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