# physics

posted by mangojuice

Apparently, this website cannot display photos, so I'm gonna type my question:

A railway truck of mass 8340kg traveling at 14.3ms-1 collides with another truck of mass 6420kg traveling at 8.78ms-1 in the same direction.

1. If after collision the two trucks become joined together, what is their initial speed?

2.Calculate the percentage of kinetic energy retained in the collision.

1. Damon

8340(14.3)+6420(8.78) = (8340+6420)v

Ke initial = (1/2)(8340)(14.3^2) + (1/2)(8340)(8.78)^2

Ke final = (1/2)(8340+6420) v^2
it better be less.

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