20 points :) pls answer correctlyy A 70.0 kg skydiver has a weight of 686 N. Just before opening the parachute, they experience 300 N of air resistance. Use F = ma to determine how much are they currently accelerating?

9.8 m/s^2 down
7.6 m/s^2 down
5.5 m/s^2 down
3.8 m/s^2 down

Amarble, a bowling ball, a basketball, and a baseball are rolling across the floor at 10 m/s. which one has the greatest kinetic energy? the marble the bowling ball the basketball the baseball

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

Which describes increasing the efficiency of energy resource