Question

If a bus decreases its speed from 100 km/h to 60 km/h in 5 s. find acceleration of the bus​

Answer 1

Answer:

acceleration of the bus

= change in velocity/ time taken

now, 100 km/h = 100× 5/18 m/s = 250/9 m/s

60 km/h = 60×5/18 m/s = 150/9 m/s

or, acceleration

=(150/9 - 250/9) / 5

= -100/45 m/s^2

= -2.22 m^2

Answer 2

Answer:

Ans. 1.72 m/s

Explanation:

Initial speed , u = 100km/hr.

= 100×1000m/60×60s

= 1000/36

= 25.2m/s

( to convert 100Km into meter and hour in second)

final speed, v = 50km/h

= 50×1000m/60×60s

= 500/36

= 16.6m/s

Acceleration = ?

time = 5s

v = v + at

16.6 = 25.2 + a × 5

5a = 25.2 - 16.6

5a = 8.6

a = 8.6/5

a = 1.72m/s

Acceleration of the bus is 1.72m/s.

Hope this helps you