Question

A car increases its speed from 20 km/h to 30 km/h in 10 seconds. its acceleration is a) 30 m/s b) 3 m/s c) 18 m/s d) 0.83 m/s calculate

Answer 1

"Ans: Acceleration = Change in velocity / time taken

ACCELERATION = (V - U)/ T

Then

Initial velocity level = 20 KM/HR

Final velocity level= 30 KM/ HR

ACCELERATION = (30 - 20) KM/HR

= 30 KM/HR SQUARE = 2.777 m/s

Time = 10 seconds

Acceleration = 2.77 m/10s*s

Acceleration = 0.28 m/s^2

Here is the solutions."

Answer 2

Unit of Acceleration is m/s^2.
a= (v2-v1)/(t2-t1)
(t2-t1)=10 sec
v2= 30 km/h = 30×5/18 = 8.33 m/s
v1= 20km/h = 20×5/18= 5.55 m/s

a= (8.33-5.55)/10 = 2.77 /10

a= 0.277m /s^2
a= 0.28 m/s^2