What is the amount of displacement of a runner who runs exactly 2 laps around a 400 meter track?

Orange juice has a lower or higher viscosity than chocolate syrup

Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.

This is the substance(s) formed in a chemical reaction.