Question

M/ u^2+r =-k-y PLEASE HELP!!!!!

Answer 1

Answer:

  (b)  as marked

Step-by-step explanation:

Subtract r, multiply by u^2/(-k-y-r), and take the square root.

  $\dfrac{m}{u^2}+r=-k-y\qquad\text{given}\\\\\dfrac{m}{u^2}=-k-y-r\qquad\text{subtract r }\\\\\dfrac{m}{-k-y-r}=u^2\qquad\text{multiply by \dfrac{u^2}{-k-y-r} }\\\\u=\pm\sqrt{\dfrac{m}{-k-y-r}}\qquad\text{take the square root}$