Question

A bus decreases its speed from 80 km/hr to 60 km/hr in 5 sec find acceleration of bus​

Answer 1

Hope it helps.................

Answer 2

Intial Velocity of The Bus(u)=80 km/h

In m/s=80×5/18

=400/18 m/s

Final Velocity of The Bus(v)=60 km/h

In m/s=60×5/18

=300/18 m/s

Time(t)=5 seconds

Using Equation of Motion

v=u+at

Where v=Final Velocity

u=Intial Velocity

a=Accerlation

t=time

$\frac{400}{18} = \frac{300}{18} \times a \times 5 \\ \\ \frac{400}{18} - \frac{300}{18} = 5a \\ \\ \frac{100}{18} = 5a \\ \\ a = \frac{100}{18 \times 5} \\ \\ a = \frac{100}{90} \\ \\ a = 1.11$

Since Velocity of car decreasing at rate of 1.11 m/s^-2 .So it can Written as -1.11 m/s^-2

$\underline{\mathbf{\huge{Accerlation={-1.11\:m/s}^{-2}}}}$