Determine new velocity? ASAP?

Question

When the two asteroids collide, they stick together. Based on your graph in Part C, determine the velocity of the new megaasteroid. Asteroids: http://media.cheggcdn.com/media/1fd/1fd12a1e-e0fc-4aa0-afd3-8a188668596d/php0hWXEs.png Part C graph:...

Answer 1

in anelastic collision the momentum is conserved
m1v1+m2v2=(m1+m2)v
then
v=(m1v1+m2v2)/(m1+m2)
v=(500*20+250*10)/(500+250)
v=12500/750=16.6 m/s