NEET Class neet Answered
A car moves a distence of 200 it covers the half of the distence at speed 40 km/h and the second half of distence at speed v the average speed is 48km/h the value of v is
Asked by khillare.sonu10 | 29 Feb, 2024, 21:44: PM
Expert Answer
Average speed 48 km/hr = 48 × (5/18) = 40/3 m/s
time of travel = distance / (average speed )
If distance travelled is 200 m with speed 40/3 m/s , then time of travel = 200 / (40/3) s = 15 s .
If half of the distance travelled with speed 40 km/hr = 40 × (5/18) = (100/9 ) m/s ,
then time to travel 100 m distance = distance/ speed = 100 / (100/9) s = 9 s
Hence remaining 100 m distance is travelled in 6 s .
Hence speed v = (100 /6 ) m/s = (100/6 ) × (18/5) = 60 km/hr
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