Question

an object starts from rest attains a velocity of 72 km/h in 5 sec . find it's acceleration​

Answer 1

Answer:

4m/s²

Explanation:

Initial velocity,u = 0 m/s

final velocity,v = 72 km/hr= 20 m/s

Time taken,t=5 sec

Acceleration,a=?

from the first equation of motion-

v=u+at

20=0+a*5

20=5a

20/5=a

4 m/s²=a

Acceleration= 4 m/s²

Sorry I didn't saw it was in km/hrs