- #1

Erenjaeger

- 141

- 6

## Homework Statement

A motorcycle has a constant acceleration of 2.80 m/s2. Both the velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from

**(a)**40.9 to 50.9 m/s, and

**(b)**70.9 to 80.9 m/s?

[/B]

## Homework Equations

V

_{f}= V

_{i}+ a*t[/B]

## The Attempt at a Solution

using that kinematic formula,

for a) 50.9=40.9+2.8*t

then divide both sides by 40.9+2.8 to solve for t

answer = 4.04[/B]

and same thing with b) but in both cases the answer is coming up as wrong. what have i done wrong?