Question

A car increases its speed from 20 km/h to 50 km/h in 10s. What is its
acceleration?

Answer 1

change in speed =(50-20)=30km/hr
30km/hr=30*5/18=8.33m/s
acceleration =change /time=8.33/10=0.83m/s²

Answer 2

Speed 2 - Speed 1 = Speed within given time

50 - 20 = 30

30 kilometers in 10 hours

Acceleration: $\frac{30}{10}$

$3$

It's acceleration is 3 km/hr.