Solving Physics Equation for v: Mistakes and Solutions

[Warwick]

Okay, I have this equation and I want to solve for v, so basicaly it's really just an algebra problem.

Original equation
20=(v)sin(35)*(159/v)+.5(-9.8)(159/v)^2

v^2=(sin(35)(159)+.5(-9.8)(159^2))/20<-- what I do, then I take it to the ^(1/2)

The answer should be 42, but I keep getting crazy answeres. What am I doing wrong?

thanks

 

[Claude Bile]

When you multiplied through by v^2, you forgot to multiply the 1st term on the RHS by v^2.

Claude.

 

[XMLT]

Can anyone help me with this question?

Use the Continuity Equation to explain how jet engines provide a forward thrust for an airplane.

I don't think only the actual equation would help to explain fully the question but I really need some specific explanation for this.