Question

the radius of A wheel of a bus is 70cm the wheel makes 10 revolution in 5 seconds The speed of the bus is

Answer 1

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radius = 70 cm = 0.7 m


Distance covered in one revolution

= Circumference of the wheel

= 2πr

= 2×22/7 × 0.7

= 4.4 m

Speed = Distance/Time

           = 4.4/0.7
Speed = 6.28 m /s

hope it help u

"NIKHIL"

Answer 2

r=70
circum.= 2πr
2×22/7×70
2×22×10
440 cm^2
number of round = 10
.. .. 440×10
. 4400m =distance
time =5 sec
speed=distance/time
==. 4400/5
..... 880m/s

Ans = 880 m/s (speed)