A bus decreases its speed from 80 km/h to 60 km/h in 5 s. The acceleration of the bus is

Question

Question

Answer 1

CONCEPT:

Equation of Kinematics: These are the various relations between u, v, a, t and s for the particle moving with uniform acceleration where the notations are used as:
Equations of motion can be written as

V = U + at

\(s =ut+\frac{1}{2}{at^{2}}\)

V2 =U2+ 2as

Where u = Initial velocity of the particle at time t = 0 sec

v = Final velocity at time t sec

a = Acceleration of the particle

s = Distance travelled in time t sec

EXPLANATION:

Given - Initial velocity (u) = 80 km/h = 22.22 m/s, Final velocity (v) = 60 km/h = 16.67 m/s, and time (t) = 5 s.

⇒ v = u + at

⇒ 16.67 = 22.22 + (a × 5)

\(\Rightarrow a = \frac{{16.67 - 22.22}}{5} = - \frac{{5.55}}{5} = - 1.11\;\, m/s^2\)