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klcarrasquillo klcarrasquillo
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2 years ago
A racing car accelerates uniformly from rest along a straight track.  This track has markers spaced at equal distances along it from the start, as shown in Figure 2.2.  The car reaches a speed of 140 km/h as it passes marker 2.

Figure 2.2




Whereabouts on the track was the car when it was travelling at half this speed, i.e. at 70 km/h?

• At marker 1

• Between marker 1 and marker 2

• Before marker 1
Textbook 

College Physics


Edition: 10th
Authors:
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kelsey9kelsey9
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2 years ago
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Before marker 1

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V1i = 0

Vf1 = 140 km/hr

Now

Vf1^2 = V1i^2 + 2ax1

140^2 = 0 + 2*a*x1 =========> a = 9800/x1

Then for V2 find x

Vf2 = 70 km/hr

Vi2 = 0

70^2 = 0 + 2*a*x2 =======> 70^2 = 2*(9800/x1)*x2

x2 = 0.25*x1

So, car will be before marker 1
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A month ago Edited: A month ago, bio_man
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