Question

The graphs below show the velocity versus time for three different cars: 1, 2 and 3. Rank these cars according to the magnitudes of their velocities, greatest first, at the time "t" indicated on the graph.

• A. 1, 2, 3
• B. 1, 3, 2
• C. 2, 1, 3
• D. 3, 2, 1
• E. 3, 1, 2

Answer 1

The correct option is B 1, 3, 2

If we draw a perpendicular to time axis from the given point $t$ , it will cut all the graph lines ($1,2,3$) at some points .Then we draw perpendiculars to the velocity axis from these points , and the points where these perpendiculars touches the velocity axis , will be the velocities of 1,2,and 3 .By this we see that perpendicular of graph 1 on velocity axis has the largest value then graph 3 and then graph 2 i.e. order is 1,3,2 .