A police van moving on a highway with a speed of 30 kmh-1 fires a bull

1.	A police van moving on a highway with a speed of 30 kmh-1 fires a bullet at thief's car speeding away in the same direction with a what speed of 192 km/hr. If the zuzzle speed of the bullet is 150 ms-1, with what speed does the bullet hit the thief,s car?[Note: obtain that speed which is relevant for damaging the thief's car]
Answer» Speed of the police van = 30 kmh^-1 = 5 x 5/3 ms^-1 = 25/3 ms^-1 Speed of thief's car = 192 kmh^-1 = 160/3 The relative speed of thief's car with respect to police van = (160/3- 25/3) ms^-1 = 45 ms^-1 Speed of bullet = 150 ms^-1 The speed with which bullet hit the thief's car = (150 - 45) ms^-1 = 105 ms^-1.

A police van moving on a highway with a speed of 30 kmh-1 fires a bullet at thief's car speeding away in the same direction with a what speed of 192 km/hr. If the zuzzle speed of the bullet is 150 ms-1, with what speed does the bullet hit the thief,s car?[Note: obtain that speed which is relevant for damaging the thief's car]

Answer»

Speed of the police van

= 30 kmh^-1 = 5 x 5/3 ms^-1

= 25/3 ms^-1

Speed of thief's car

= 192 kmh^-1 = 160/3

The relative speed of thief's car with respect to police van

= (160/3- 25/3) ms^-1 = 45 ms^-1

Speed of bullet = 150 ms^-1

The speed with which bullet hit the thief's car

= (150 - 45) ms^-1 = 105 ms^-1.