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18. A ship moves due east with a speed of 40 m/h for 1 hour and thenmoves due north with a speed of 30 m/h for another 1 hour. Calcuits average speed. |
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Answer» Distance travelled towards east = 40m/h * 1 hr = 40m Distance travelled towards north = 30m/h * 1 hr =30m . Displacement vector will be the hypotenuese if we draw the triangle. Hence displacement = root of ( 40^2 + 30^2) = 50m .Total time taken to reach the final point = 1hr east + 1hr north = 2 hrs Average velocity = 50m / 2 hrs =25m/hr |
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