Is it realistic to apply the conservation of momentum to real ...

[ssal]

Is it realistic to apply the conservation of momentum to real world collisions where external forces act?
 
  What will be an ideal response?

Question 2

An electron is accelerated through 100 kV. By what factor has its mass increased with respect to its rest mass?
 
  A)
 
  1.20
  B)
 
  1.55
  C)
 
  4.25
  D)
 
  6.50
  E)
 
  8.00

[izzat]

Answer to Question 1

Yes, in a collision the force each object exerts on the other acts only over a brief time interval and is very strong relative to the other forces. If the momenta immediately before and after the collision is measured, momentum will be very nearly conserved.

Answer to Question 2

A

[ssal]

Wow, this really help

[Chelseyj.hasty]

Gracias!