Kinematic Equation Rearrangement

[EthanG02]

So to an extent, I am able to rearrange simple kinematic equations; I can solve for Vi from the equation
Vf = Vi +a x t, but I need some help with some other kinematic equations.

For my first problem, I need to solve for a variable, (whether it be Vi, Vf, or t) from d= 1/2 (Vi+Vf) t. It seems easy, I know, but I'm just confused on the steps.

For my second problem, I need to do the same, solve for a variable (d,Vi, or a,) from the equation
Vf^2 = Vi^2 + 2ad.

If I could get some help fast, that would be great! I have a test on this tomorrow, and I don't look forward to failing it.

 

[berkeman]

So to an extent, I am able to rearrange simple kinematic equations; I can solve for Vi from the equation
Vf = Vi +a x t, but I need some help with some other kinematic equations.

For my first problem, I need to solve for a variable, (whether it be Vi, Vf, or t) from d= 1/2 (Vi+Vf) t. It seems easy, I know, but I'm just confused on the steps.

For my second problem, I need to do the same, solve for a variable (d,Vi, or a,) from the equation
Vf^2 = Vi^2 + 2ad.

If I could get some help fast, that would be great! I have a test on this tomorrow, and I don't look forward to failing it.

Welcome to the PF.

In your future schoolwork posts here, please use the Homework Help Template that you are provided when starting a new thread. Please do not delete it. It helps you to organize your thoughts, and helps us see what you think the Relevant Equations are.

For your questions above, start by expanding out any terms, and then you can isolate the variable you want to solve for using simple algebra. Can you try that for the two equations you've shown above?