Question

. A bus decreases its speed from 80km/hr to 60km/hr in 5 s. Find the acceleration of the bus.​

Answer 1

Answer:

The acceleration = -4000 m/s²

Explanation:

By using the formula a = v-u and by putting the

t

values accordingly. 60 - 80 = -20 = -4 km/s or

5. 5.

-4000m/s²

Answer 2

Answer:

• $\rm{1.1m/s^{2}}$

Explanation:

Given

• Initial velocity (u) = 80km/hr
• Final velocity (v) = 60km/hr
• Time taken (t) = 5 seconds
• 1km/h = 5/18m/s

• $80 \times 5/18 = 22.22m/s$
• $60 \times 5/18 = 16.67 m/s$

using 1st equation of motion

$\implies\:\:\:v = u + at$

$\implies\:\:\: 16.67 = 22.22 + a(5)$

$\implies\:\:\: 16.67 - 22.22 = 5a$

$\implies\:\:\:- 5.55 = 5a$

$\implies\:\:\:a = 1.1 {ms}^{ - 2}$

The acceleration of the bus is 1.1m/s²