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## Homework Statement

A student riding a bicycle begins to go downhill and accelerates at a rate of 1.8m/s2. If the acceleration lasts for 2.4s, and the final speed of the bicycle is 10.2m/s, at what speed was he initially travelling?

a = 1.8

t = 2.4

vf = 10.2

vi = ?

## Homework Equations

a = vf - vi / t

## The Attempt at a Solution

I first isolated vi to solve for the problem and got : vi = vf-a/t and then plugged in the variables but it didn't work.