Two carts A and B collide on a low-friction track. Measurements show that their initial and final momenta are
vec(p)_(A,i)=+9.5kg*(m)/(s)*hat(i)*vec(p)_(A,f)=+2.0kg*(m)/(s)hat(?)
.
vec(p)_(B,i)=-3.5kg*(m)/(s)hat(i)
, and
vec(p)_(B,i)=+4.0kg*(m)/(s)hat(i)