Answer:
Explanation:
initial velocity, u = 0 m/s
time, t = 8.99 s
final velocity, v = 21.9 m/s
diameter of tyre, D = 57.5 cm
(a) Let a is the acceleration, and n be the number f revolutions made by the tyre.
Use first equation of motion
v = u + at
21.9 = 0 + a x 8.99
a = 2.44 m/s²
Use third equation of motion
v² = u² + 2 a s
21.9 x 21.9 = 0 + 2 x 2.44 x s
s = 98.28 m
Circumference of wheel, S = π x D = 3.14 x 0.575 = 1.8055 m
number of revolutions, n = distance / circumference
n = 98.28 / 1.8055
n = 54.4
