Question $7$

$5$ pts

Granny and junior are facing each other on an ice ring. They are wearing ice skates and we neglect friction. Granny is $200$ pounds and junior $50$ pounds. Granny pushes Junior who moves back at a speed of $2\frac{m}{s}.$ What is the speed of Granny $($action$-$reaction and conservation momentum$)$

obviously a recoil situation

$2\frac{m}{s}$

$4\frac{m}{s}$

$0$

$0\mathrm{.}5\frac{m}{s}$

$8\frac{m}{s}$

$2\frac{m}{s}$