Question

If I am driving down the highway going north at 50 miles per hour, and another car is driving south at 75 miles per hour. How fast is the car coming toward me?

Answer 1

V₂₋₁ = 50 [miles/h]

Step-by-step explanation:

In order to solve this problem we must use the concept of relative velocities.

Where:

V1 = 50 [miles/h]

V2 = 75 [miles/h]

V₂₋₁ = Relative velocity among the two cars.

V₂₋₁ = 75 - 25 = 50 [miles/h]

That is, the car that goes at 50 miles per hour, sees how the second car approaches at 50 miles per hour.