A racecar accelerates uniformly from rest along a straight track. This track has markers spaced at equal distances along it from the start, as shown in the diagram. The car reaches a speed of 140 km/h as it passes marker 2. Where on the track was the car when it was traveling at 70 km/h?before marker 1at marker 1between marker 1 and marker 2
• The car accelerate from rest. That is, the speed = 0 km/h
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• The acceleration is uniform
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• The markers are placed at equal distances
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• The car reaches a speed of 140 km/h as it passes marker 2
Since the markers are placed at equal distances along the track, the speed also increases uniformly across the track.
The car has attained a speed of 140 km/h slightly before reaching marker 2, and maintains the same speed to marker 2. This means that the speed of the car became 70 km/h before it reached the marker 1
