Question

The wheel of a motorcycle 70cm in diameter makes 40 revolutions in every 10sec.What is the speed of motorcycle n km/hr?
A) 13.68kmph
B) 31.68kmph
C) 41.68kmph
D) 45.68kmph

Answer 1

$hey \: mate \\ \\ here \: is \: ur \:ans$


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we will first calculate the distance covered in given time.

 

Distance covered will be : Number of revolutions x Circumference

Now we can calculate the speed. 

 

Radius of wheel = 70 / 2 = 35 cm

 

Distance covered in 40 revolutions will
be 40*circumferene=40*2πr=40*2*227*35=8800cm40*circumferene=40*2πr=40*2*227*35=8800cm = 88 m

 

Distance covered in 1 sec  = 8810=8.8m/s=8.8*185km/hr=31.68km/hr8810=8.8m/s=8.8*185km/hr=31.68km/hr




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Hope it helps u

Be brainly ❤❤❤
 

Answer 2

--------hope it helps-----