Question

Two cars are facing each other from opposite ends of a 500m long road. Car A begins travelling at a constant speed of 20m/s. At the same moment, Car B begins travelling toward Car A at a constant speed of 16m/s. How far will Car A move before colliding with Car B?

Answer 1

Correct answer: D₁ = 277.78 m

Step-by-step explanation:

Before colliding with car B, car A will cross the next distance:

D₁ = V₁ t

Before colliding with car A, car B will cross the next distance:

D₂ = V₂ t

The total distance is:

D = D₁ + D₂ => D = V₁ t + V₂ t => D = t (V₁ + V₂) => t = D / (V₁ + V₂)

t = 500 / (20 + 16) = 500 / 36 = 13.89 seconds

D₁ = V₁ t = 20 · 13.89 = 277.78 m

D₁ = 277.78 m

God is with you!!!