Pixel is wandering around the house when she gets a case of what can only be described as the rips. She runs through the house and then finally begins to slow down for $6\mathrm{.}0s$ to $1\mathrm{.}5\frac{m}{s}.$ a$)$ If Pixel's displacement during this time is $19\mathrm{.}5m,$ what was her initial velocity when she started slowing down? b$)$ What is her acceleration during the slow down?