a student who's mass is 150kg is skateboarding down the sidewalk at an acceleration of 18.5m/s2, what is the net force

Aballet student who learns with the of his instructor is demonstrating learning.

The average time that it takes for the car to travel the first 0.25m is s. the average time to travel just between 0.25 m and 0.50 m is s. given the time taken to travel the second 0.25 m section, the velocity would be m/s.

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap