A car travels at a speed of 45 m/s for a time interval T and then travels at a speed of 15 m/s for another time interval 2T. Find average speed for the total journey.
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Answer:
Explanation:
Distance = speed × time
Total distance = [(45×T) + (15×2T)] = (45T + 30T) = 75T
Total time taken = T + 2T = 3T
Average speed = Total distance ÷ total time taken = 75T ÷ 3T = 25 m (as T cancelled each other out)
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