Question

BRAINLIEST FOR CONSERVATION OF MOMENTUM QUESTION

Answer 1

Answer:

$v=3.809\,m/s$

Explanation:

Since momentum is conserved, momentum right before and after the boy jumps onto the skateboard should be the same.

$p_{i} =40kg*4m/s=160kg*m/s$

Where $p_{i} = initial\,momentum$

Then calculate final momentum:

$p_{f}=(40kg+2kg)*v=42v$

$160=42v$

$v=3.809\,m/s$