An object moved from A to B, covering a distance of 300 m at a speed of 20m/s. It then travelled from B to C, covering another 300 m in 15 seconds. Find the average speed of the object in travelling from A to C, if it stopped at B for 30 seconds.

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Solution

From A to B:
Distance travelled = 300m
Speed = 20m/s
Thus, time taken = 300/20 = 15seconds

From B to C:
Distance travelled = 300m
Time taken = 15seconds.

Total distance = (A to B) + (B to C) = 300m + 300m = 600m
Total time = 15s + 30s(time of stop) + 15s = 60s

Average speed = total distance/total time = 600m/60s = 10m/s

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