Question

A bus decreases its velocity from 54 kmph to 36 kmph in 5 seconds. Find its acceleration.

Answer 1

Answer :-

• Acceleration of the bus is -1 m/s.

Step-by-step explanation :-

Given :

• Initial velocity (u) = 54 Km/h
• Final velocity (v) = 36 Km/h
• Time taken (t) = 5 sec

To find :

• Acceleration (a)

Solution :

Acceleration is given by,

⇒ Change in velocity/Time taken

⇒ (v - u)/t

__________________________

Here,

⇒ u = 54 Km/h

⇒ 54 × 5/18

⇒ 15 m/s

__________________________

⇒ v = 36 Km/h

⇒ 36 × 5/18

⇒ 10 m/s

__________________________

Substituting,

⇒ (10 - 1-5)/5

⇒ 5/5

⇒ -1

__________________________

• Acceleration of the bus is -1m/s.

Answer 2

Answer:

Acceleration = - 1m/s²

Step-by-step explanation:

Given -

• Initial velocity (u) = 54km/hr = 15m/s
• Final velocity (v) = 36m/hr = 10m/s
• Time (t) = 5 seconds

Solution -

Acceleration (a) -

• v-u/t
• 10-15/5
• -5/5
• -1m/s ²

Acceleration is - 1m/s²