If the speed of a car is 20 ms−1, what is the speed in km h−1?
Given that the speed of a car =20 ms−1=20 m1 s [1 m=11000 km,1 s=13600 h] =20×11000 km1×160×60 h =20×36001000 km h−1 =72 km h−1.
If the speed of a car is 25 m/s. What is its speed in km/h?
A police van moving on a highway with a speed of 30kmh−1 fires a bullet at a thief’s car speeding away in the same direction with a speed of 192 kmh−1. If the muzzle speed of the bullet is 150 ms−1, with what speed does the bullet hit the thief's car? (Note: Obtainthat speed which is relevant for damaging the thief's car).