hi please help true or false. i'll upvote asap

1. Position and acceleration are both vector quantities. 2. The y-component of (21) is 1. 3. A runner who makes one complete lap around a 400-m race track undergoes a displacement of 400 m. 4. A two-dimensional quantity of magnitude 10 and directed at 30 below the +r-axis can be represented as ( 0.8 5