Question

2. A bus decreases its speed from 80 km h^-1 to 60 km h^-1 in 5 s. Find the acceleration of the bus.
​

Answer 1

• Final Velocity = 60km/hr

→ converting it into m/s, we get -

$60 \times \frac{1000}{60 \times 60} \\ \\ 37.5 \: m \:/s$

• Initial Velocity = 80km/hr

→ converting it into m/s

$80 \times \frac{1000}{60 \times 60} \\ \\ 50 \: m/s$

• Time taken = 5 seconds

$acceleration \: = \: \frac{v - u}{t} \\ \\ a = \frac{37.5 - 50}{5} \\ \\ a = \frac{ - 12.5}{5} \\ \\ a = - 2.5 \: m/ {s}^{2}$

Here, as the bus is decelerating, acceleration/deceleration is -2.5 m/s²

------------------------------------------------------------