A50 kg boy jumps off the front of a 1.5 kg skateboard moving forward. find the skateboard’s velocity immediately after the boy jumps, assuming that the skateboard’s initial velocity is 3.5 m/s and the boy’s velocity when jumping off the front is 5 m/s.

Here in this case we can say that there is no external force on skate board and boy as a system

so here we will use the theory of momentum conservation

So we will say

initial momentum of boy + board = final momentum of boy + board

so here the skateboard will move off in opposite direction with speed 1.35 m/s

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.