The number of revolution = 31.83
Explanations:The car starts from rest
The initial velocity, u = 0 m/s
The final velocity, v = 72 km/hr
v = 72 x 1000/3600
v = 20 m/s
The time, t = 5 secs
The radius of the wheel of the car, r = 0.25 m
Find the acceleration using the formula
v = u + at
20 = 0 + 5a
5a = 20
a = 20/5
a = 4 m/s
Find the distance using the formula
s = ut + 0.5at²
s = 0(5) + 0.5(4)(5²)
s = 0 + 50
s = 50m
The number of revolution is calculated using the formula below:
[tex]n\text{ = }\frac{s}{2\pi r}[/tex][tex]\begin{gathered} n\text{ = }\frac{50}{2\times3.142\times0.25} \\ n\text{ = }31.83 \end{gathered}[/tex]The number of revolution = 31.83
