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## Homework Statement

A roller coaster reaches the top of the steepest hill with a speed of 1.4 m/s. It then descends down the hill, which is at an average angle of 45° and is 50 m long. What will its speed be when it reaches the bottom? (Answer: 26 m/s)

## Homework Equations

Fnet=ma

Fg=mg

## The Attempt at a Solution

I drew a free body diagram, separating the x and y components of Fg. This is futile as mass is not given, thus Fg, Fn, and Fnet cannot be calculated. Am I missing something here?