Question

The diameter of the wheel of a vehicle is 5metre it makes 7 revolutions per 9seconds what is speed of vehicle in km/h​

Answer 1

Step-by-step explanation:

C of wheel = πd = 22/7 × 5 = 110/7

Distance covered in 9sec = 110/ 7 ×7 = 110 m

speed per second = 110 / 9

1 sec = 12.2 m

1 hrs = 3600 sec

distance in 1 hr = 3600 × 12.2

= 44000 m

= 44 KM

44 km/hr

Answer 2

Answer:

44 kilometres / hour

Step-by-step explanation:

consider # to be pi

perimeter of circle = 2#r

r = d/2 = 5/2 metres

perimeter of circle = 2 * # * r

= 2 * 22/7 * 5/2

= 110/7

9 seconds = 9/3600 hours = 1/400 hours

we know that distance covered by a wheel ( or any circular object ) if we are given its perimeter and number of revolutions, is perimeter * number of revolutions

so, in 1/400 hours ( 9 seconds ), distance covered = perimeter of circle * number of revolutions

= 110/7 * 7 ( where 7 is number of revolutions )

= 110 metres

= 110/1000 kilometres = 11/100 kilometres

speed = distance/time

= ( 11/100 ) / ( 1/400 )

= ( 11/100 ) * 400

=11 * 4

=44 kilometres per hour

pls mark brainliest