Question

A bus decreases its speed from 90km/hr to 36km/hr in 10 seconds. Find the acceleration of the bus in m/s2.

Answer 1

Given :

• Initial Velocity (u) = 90 km/hr

• Final Velocity (v) = 36 km/hr

• Time (t) = 10 seconds

To Find :

• Acceleration of the bus

Solution :

First of all let's convert given velocities into m/s

• 90 km/ hr

→ 90 × 5/18

→ 5 × 5

→ 25 m/s

• 36 km/hr

→ 36 × 5/18

→ 2 × 5

→ 10 m/s

Now,

★ Acceleration = Final Velocity - Initial Velocity/Time taken

★ a = v - u/t

→ a = 10 - 25/10

→ a = -15/10

→ a = -1.5 m/s²

Acceleration of the bus is -1.5 m/s²

Since the speed of the bus is decreasing, therefore the value of the acceleration is in negative.