Question 40: A police van moving at 30 km/h fires a bullet at a thief’s car speeding away at 192 km/h. The muzzle speed of the bullet is 150 m/s.
I. The speed of the bullet with respect to the ground is the sum of its muzzle speed and the speed of the van.
II. The speed relevant for damaging the thief’s car is the speed of the bullet relative to the thief’s car.
III. The speed of the thief’s car is approximately 53.3 m/s.
IV. The speed of the bullet with respect to the thief’s car is 105 m/s.
V. To calculate the relative speed, all speeds must first be converted to a consistent unit system (e.g., m/s).
