Man, these types of problems are given me a run for my money
Find the instantaneous velocity at t = 4
I get this problem simplified down to
Which I know is right.
But can i cancel the denominator by making the equation then plugging in 4 and getting 6
2. Using symbols like x and a in a motion problem is just plain confusing when they do not represent displacement and acceleration.
You need to develop understanding on how to use these formulae with notation appropriate to the context. You also need to understand why this is important.