a person moves for 20 sec such that for just 10sec he travells with respect 20 m/sec and remaining 10 sec move travel with speed 30 m/sec find avg speed???
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Answer:
40 m/s
Explanation:
Given,
Total Time = 20 sec
Speed in the first 10 sec = 20m/s
Distance travelled in the first 10 sec = (20*10) m = 200m
Speed in the last 20 sec = 30 m/s
Distance travelled in the last 20 sec = (30*20)m = 600m
Avg. Speed = (600+200)/20
= 40m/s
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