Question

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​

Answer 1

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