The velocity of car is 18 ms-1. Express this velocity in kmh-1.
Velocity of Car = 18 ms-1
To express this velocity in kmhr-1 we need the conversion factor which is calculated as under:
1 km = 1000 m
So, 1 m = km
Now, 1 hr = 60 minutes = 60 × 60 s = 3600 s
So, 1 s = hr
Now, Velocity of car = 18
= 18
= kmh-1
= 64.8 kmh-1