A man jumps out of a plane without a parachute. He eventually reaches a point where the force of gravity is equal and opposite to the force of air resistance (friction)? Which best describes his motion at this point. a
The man continues to descend, but with constant speed.
b
The man falls with a smaller but non-zero acceleration.
c
The man descends with slower and slower speed.
d
The man comes to a stop.
e
The acceleration of the man is now upward.
the

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?