- #1

AshleyJayda

- 1

- 0

I know how to solve the equation:

1) x = x0 + v0t + ½ at2

2) a is unknown therefore solve for a

My question is how do you know the the initial velocity is negative? I would say the initial velocity is 5m/s and after it changes direction velocity is then -5m/s. The solution says the opposite, i.e. initial velocity is -5m/s and final velocity is 5m/s. How do you know? Is there some hard and fast rule I am unaware of?

Please help.