What is the net force on a skydiver falling with a constant velocity of 0 m/s downward?

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below. your friend goes first, and you follow after he has dropped a distance of 2.0m. when your friend hits the water, is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Name two kinds of practical electric pumps.

Which radioisotope is used in dating geological formations?