the minute hand of a clock is 7cm long. Calculate its average speed and average velocity if it travels from 10: 00 to 10 : 30
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1) Radius = 7cm
Distance = Half the Circumference of the circle= 2πr/2= πr= 22/7 x 7= 22 cm
Displacement = Diameter = Twice the radius = 2 x 7 = 14 cm
2) Circumference of a circle = 2πr
Distance travelled by an athlete = 2 x 22/7 x 100 = 628.57 cm
3) average speed = total distance/total time
Total distance = (500 + 200)m = 700m
Total time = (2.10 + 1.00)min =3.10 min =186sec
Average speed = 700/186 = 3.763 m/s
Average velocity = Total displacement from initial position /total time
Displacement = (500 – 200)m = 300m
Time = 3.10min = 186 sec
Average velocity = 300/186 = 1.612 m/s
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