[单选题]
A cart starts from rest n4t tt20ii+(dbs97o / 0mztsenuzp+sbgv 5i4 and accelerates heo4*gd a/zrvydyhh.3: 28dbat $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?
