Question

A motorcyclist drives from A to B with a uniform speed of 30 km h⁻¹ and returns back with a speed of 20 km h⁻¹. Find its average speed.

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?