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Question

# An object travels at 50 m s−1 for the first 2 seconds and travels at 70 m s−1 for the next 2 seconds. What is its average speed for the first 4 seconds?

A
70 m s1
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B
50 m s1
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C
40 m s1
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D
60 m s1
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Solution

## The correct option is D 60 m s−1Given: Speed in first 2 seconds = 50 m s−1 Speed in the next 2 seconds = 70 m s−1 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 m s−1

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