Question

Using following data, draw time - displacement graph for a moving object: | Time (s) | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | |---|---|---|---|---|---|---|---|---|---| | Displacement (m) | 0 | 2 | 4 | 4 | 4 | 6 | 4 | 2 | 0 | Use this graph to find average velocity for first 4 s, for next 4 s and for last 6 s.

Name the instrument which is used to measure the instantaneous speed of a vehicle.

Two cars started simultaneously towards each other from towns A and B, which are 480 km apart from each other. The first car started from town A and reached the town B in 8 hours. The second car started from town B and reached the town A in 12 hours. If both the cars moved with uniform velocities without any break, find out when the two cars cross each other after starting and at what distance from the town A?

Consider two postmen. They start walking towards each other from a distance of 210 yojanas (Yojana is a unit of distance used in ancient India). One travels 9 yojanas per day and the other covers 5 yojanas per day. Can you determine in how many days they will meet each other?