A 55 kg student was riding his skateboard to school. He traveled 200 meters in 40 seconds. What was the student’s average speed in meters per second

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath.