Question

A bus increases its velocity from 72 km/h to 90 km/h in 5 seconds.The
acceleration of the bus is ---------m/s2 *​

Answer 1

Answer: 1

v=25m/s u=20m/s

v-u=at

25-20=a(5)

a=1m/s2

Explanation:

Answer 2

Initial velocity of the bus (u) = 72 km/h

➳ u = 72 km/h

➳ u = 72 × ⁵/₁₈ m/s

➳ u = 20 m/s

Final velocity of the bus (v) = 90 km/h

➳ v = 90 km/h

➳ v = 90 × ⁵/₁₈ m/s

➳ v = 25 m/s

Time taken (t) = 5 s

______________________________

★ Acceleration (a) : It is defined as rate of change in velocity

➤ a = ( v - u ) / t

➤ SI units : m/s²

______________________________

➠ a = ( 25 - 20 ) / 5

➠ a = 5 / 5

➠ a = 1 m/s²  $\pink{\bigstar}$

Acceleration of the bus is 1 m/s²

More Info :

★ Equations of motion :

➙ v = u + at

➙ s = ut + ¹/₂ at²

➙ v² - u² = 2as

➙ Sₙ = u + ᵃ/₂ ( 2n - 1 )