Question

a bus decreases its speed from 80 km/hr to 60km/hr in 5 sec. find the acceleration of the bus??? give ans step by step in understandable way plzzzzzzzz...

Answer 1

Given:-

• Initial velocity of bus (u) = 80km/h

• Final velocity of car bus(v) = 60km/h

• Time taken (t) = 5s.

To Find:-

• Acceleration of the bus(a).

Solution :-

Firstly we change the velocity of bus in m/s

Initial velocity = 80× 5/18 = 400/18=200/9 m/s

Final velocity = 60*5/18 = 300/18 = 150/9m/s

By using first equation of motion

⟹ v = u+at

Put the value which is given above

⟹ 200/9 = 150/9 + a*5

⟹200/9 - 150/9 = a *5

⟹50/9 = a *5

⟹a = 5.55/5

⟹a = 1.11 m/s²

Additional Information !!

The rate of change of velocity at per unit time is called acceleration .

✧ SI unit of acceleration is m/s²

✧ It is vector Quantity ( both magnitude and direction).