Question

The velocity of a car changes from 36 km/hr to 72 km/hr in 10 second. What is its acceleration ?

​

Answer 1

Answer:

Explanation:in the given question we have

u=36 km/hr =36×  

18

5

​  

m/s=10m/s

v= 72 km/hr=72×  

18

5

​  

m/s=20m/s

t=10 s

a=?

we know the formula

v= u +at

20 = 10+ a 10

20-10 =10 a

10 = 10 a

a = 1 m/s  

2

 

Answer 2

$acceleration = \frac{v - u}{t} \\ here \: u= inital \: velocity \\ v = final \: velocity \\ \\ \frac{72 - 36}{10} = \frac{36}{10} = 3.6m {s}^{2}$