Question

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

Answer 1

Answer:

Before marker 1

Step-by-step explanation:

Note the following points:

• The car accelerate from rest. That is, the speed = 0 km/h

,

• The acceleration is uniform

,

• The markers are placed at equal distances

,

• 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