Question

A bus increases its speed from 20 km/h to 50 km/h in 10 seconds
20 km/h to 50 km/h in 10 seconds. find its acceleration ​

Answer 1

Answer:

Initial velocity = u = 20km/hr = 20 x 5/18 = 5.56 m/s

Final velocity = v = 50 km/hr = 50 x 5/18 = 13.89 m/s 

Time = t = 10 sec

Acceleration = a 

a = (v- u) / t

  = (13.89 -  5.56) / 10

  = 0.833 m/s²

Answer 2

Explanation:

use formula a = (v-u) / t, also use first equation of motion v=u+at

firstly convert km/h into m/s

20*5/18=5.555

again, 50*5/18= 13.88

so use formula

v=u+at

13.88=5.55+a*10

13.88-5.55=10a

8.33=10a

8.33/10=a

0.833 = a

Acceleration = 0.833m/s Square