Question

a car start from rest & attain a velocity of 18 km/ hr in 2s. find acceleration in SI units?

Answer 1

18 km per hour is equal to 5 M per second
a = (v-u)/t
= (5-0)/2
= 5/2
= 2.5m/s²

Answer 2

We know,
1 km = 1000 m
18 km = (18)(1000) m
= 18000 m
1 hr = 60 s
Now,
Acceleration = 18000÷2
= 9000 m/s² .