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Question

An object travels at 50 ms1 for the first 2 seconds and travels at 70 ms1 for the next 2 seconds. What is its average speed for the first 4 seconds?

A
50 ms1
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B
70 ms1
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C
60 ms1
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D
56 ms1
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Solution

The correct option is C 60 ms1
Given:
Speed in first 2 seconds = 50 ms1
Speed in the next 2 seconds = 70 ms1
Distance travelled in the first 2 seconds
= 50×2=100 m
Distance travelled in the next 2 seconds
= 70×2=140 m

Total distance travelled=100+140=240 m
Total time taken =4 s
Average speed=Total distance coveredTotal time taken=2404=60 ms1

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