A very heavy object moving with velocity v collides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object after collision?

Question

anonymous · Answer

$$V  -  -V$$

anonymous · Answer

Use the conservation of momentum to set up equation: $$Mv-mv=Mv _{1}+mU _{1}$$ and solve for $$U _{1}$$
that is the speed of the little object after collision, M is the mass of the big object, m i sthe mass of the smaller object, v is the speed of the two objects before collision and v1 is the speed of the large object after collision.