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## Homework Statement

A bus is descending a uniform 20 degree slope. It brakes with constant deceleration. A pendulum moves 10 degrees away from the vertical to the downward side. Find the acceleration of the bus.

....|

.../|

... ../.|

.../10|

.../...|.../

...O...|.../

....|/

.../.|

.../...|

.../...|

../...20...|vertical

/_______ |___________horizontal_____

## Homework Equations

F=ma

## The Attempt at a Solution

I can deduce the x-component of the acceleration:

ax = g tan 10 = 1.73ms^-2

The expected answer is 2.0ms^-2. I can't see how to relate the twenty degree slope to the x component of the acceleration to calculate the total acceleration.

Any help or advice gratefully received...