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Two cars are travelling towards each other at speed of 20 m s−120 m s−1 each. When the cars are 300 m300 m apart, both the drivers apply brakes and the cars retard at the rate of 2 m s−22 m s−2. The distance between them when they come to rest is :

Question

Two cars are travelling towards each other at speed of 20 m s−120 m s−1 each. When the cars are 300 m300 m apart, both the drivers apply brakes and the cars retard at the rate of 2 m s−22 m s−2. The distance between them when they come to rest is :

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Solution

Primero, determinemos la distancia que recorre cada coche antes de detenerse. Utilizaremos la fórmula de movimiento rectilíneo uniformemente acelerado:

v2=u2+2as v^2 = u^2 + 2as

donde:

  • v v es la velocidad final (0 m/s, ya que los coches se detienen),
  • u u es la velocidad inicial (20 m/s),
  • a a es la aceleración (en este caso, la desaceleración, -2 m/s²),
  • s s es la distancia recorrida.

Reorganizando la fórmula para encontrar s s :

0=(20)2+2(2)s 0 = (20)^2 + 2(-2)s 0=4004s 0 = 400 - 4s 4s=400 4s = 400 s=100m s = 100 \, \text{m}

Cada coche recorre 100 metros antes de detenerse. Dado que los coches estaban inicialmente a 300 metros de distancia, la distancia entre ellos cuando ambos se detienen es:

300m100m100m=100m 300 \, \text{m} - 100 \, \text{m} - 100 \, \text{m} = 100 \, \text{m}

Por lo tanto, la distancia entre ellos cuando se detienen es de 100 metros.

This problem has been solved

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