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# A racing car accelerates uniformly from rest along a straight track. This track has markers spaced ...

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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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 V1i = 0Vf1 = 140 km/hrNowVf1^2 = V1i^2 + 2ax1140^2 = 0 + 2*a*x1 =========> a = 9800/x1Then for V2 find xVf2 = 70 km/hrVi2 = 070^2 = 0 + 2*a*x2 =======> 70^2 = 2*(9800/x1)*x2x2 = 0.25*x1So, car will be before marker 1
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