- #1

sammyg18

- 2

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## Homework Statement

In a classroom demonstration, a glider moves along an inclined track with constant acceleration. It is projected from the low end of the track with an initial velocity. After 8.2 s have elapsed, it is 103.3 cm from the low end and is moving along the track at a velocity of -15.1 cm/s. Find the initial velocity (cm/s) and the acceleration (cm/s^2).

## Homework Equations

xf = xi + 0.5 (vi + vf) t

xf = xi + vi t + 0.5 a t^2

a = (vf - vi)/t

I honestly might be using equations that are totally wrong. I have no idea.

## The Attempt at a Solution

First I tried xf = xi + 0.5 (vi + vf) t and I came up with 10.1 cm/s for vi but that's wrong. Then I tried xf = xi + vi t + 0.5 a t^2 and I plugged a = (vf - vi)/t Into the equation for a but I couldn't solve it through for vi. I'm definitely missing something or doing something wrong :(