The following table shows the distance covered by a motor bike in different time intervals.
Calculate the average speed (P) of the body and the speed of the body (Q) in the interval 12:00−12:30h.
A
P=1009ms−1; Q=503ms−1
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B
P=1756ms−1; Q=503ms−1
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C
P=503ms−1; Q=1009ms−1
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D
P=1756ms−1; Q=1756ms−1
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Solution
The correct option is AP=1009ms−1; Q=503ms−1 From the given table, we can calculate the total time and total distance, as follows: The average speed of the body =Total distanceTotal time
P=80km2h=40kmph =40×518ms−1 =20018ms−1=1009ms−1
The speed of the body in the time interval 12:00−12:30h is: Q=30km30min=1km1min=1000m60s Q=100m6s=50m3s=503ms−1