Question

Q. Speed of bus decreases
from 80 kilometre per hour to
60 kilometre per hour in 10
second then its acceleration is​

Answer 1

Initial speed u=80 km/h=80×

18

5

=22.22 m/s

Final speed v=60 km/h=60×

18

5

=16.67 m/s

Using v=u+at

Or 16.67=22.22+α×5

⟹ a=−1.1 m/s

2

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Answer 2

Answer:

-0. 555 m s-2

Explanation:

initial speed = 80km / hour

1 km/ hour = 5/18 m/sec

= 80 × 5/18 = 22.22m/s

final speed = 60km/hour

= 60 × 5/18 = 16.67m/sec

t = 10 sec

acceleration = v-u ÷ t

= 16.67 - 22.22 ÷ 10

= - 5.55 ÷ 10

= - 0.555 ms-2