Question

A railroad car whose mass is 30,000. kg is traveling with a velocity of 2.2 m/s due east and collides with a second railroad car whose mass is also 30,000. kg and is at rest. If the two cars stick together after the collision, what is the velocity of the two cars?

Answer 1

Answer:

V = 1.1 m/s

Explanation:

given,

mass of railroad car 1 , m =  30,000. kg

travelling at the speed , u = 2.2 m/s

mass of car 2, M =  30,000. kg

initial speed, u' = 0 m/s

final speed of the car after collision, V = ?

using conservation of momentum

  m u + M u' =  (M+m)V

 30000 x 2.2 + 0 = (30000 + 30000) V

  60000 V = 66000

  $V= \dfrac{66000}{60000}$

          V = 1.1 m/s

he velocity of the two cars is equal to V = 1.1 m/s