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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.

Answer»

Distance travelled towards east = 40m/h * 1 hr = 40m

Distance travelled towards north = 30m/h * 1 hr =30m

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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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