# #

is following $$m$$ behind a when it suddenly brakes with an acceleration of - $$m/s^2$$. Both ’s and the in front of were initially travelling at $$m/s$$. begins to brake ( with the same acceleration as the in front) $$s$$ after the in front of . $$s$$ after the in front of starts to brake, hits their .

## Part 1#

At what speed is ’s travelling when hit the in front of them?