a 4.0 kg railroad car moving at 8.0 ms to the right collides with 1.0 kilogram ball at rest after the collision the 4.0 kg ball moves at 4.8 ms to the right what is the velocity of 1 kg ball

Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.