Question

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

Answer:

-10/9 m/s²

Explanation:

Given:

• initial velocity of the bus = 80 km/h

80 km/h = 80×5/18 = 200/9 m/s

• Final velocity of the bus = 60 km/h

60 km/h = 60×5/18 = 150/9 m/s

• Time taken = 5 seconds

to find:

• Acceleration of the bus

acceleration=(final velocity-initial velocity)/time

acceleration=(150/9-200/9)/5

acceleration=(-50/9)/5

acceleration=-10/9 m/s²

the acceleration of the bus is equal to -10/9 m/s²

Answer 2

Given:-

Initial velocity ,u = 80km/h

Final velocity ,v = 60km/h

Time taken ,t = 5 s

Hence, the acceleration of the bus is approximately 1.12 m/s²