Predict the motion of the parachute humans after you throw them up. Describe the speed and acceleration of the human as it goes up, falls back down, and after the parachute opens.
When a parachute human is thrown up, their initial motion will be determined by the throwing force and their initial velocity. Assuming the parachute is not deployed yet, the human will experience an upward acceleration due to the force of the throw and the gravitational pull acting against it. As they move upwards, their speed will gradually decrease due to this opposing force, until they reach the highest point of their trajectory.
At the highest point, the human briefly experiences zero velocity, and at this point, their acceleration is solely due to gravity acting downwards. As they fall back down towards the ground, they will accelerate downwards under the influence of gravity. Their speed will increase initially as they descend, reaching its maximum as they get closer to the ground.
Once the parachute is deployed, it will create air resistance against the motion of the human. This air resistance creates a force opposite to the direction of their motion, significantly slowing them down. As a result, the human's speed will decrease significantly, and they will gradually reach a new, slower terminal velocity.
Upon reaching this terminal velocity, the human will experience zero acceleration since the opposing forces of gravity and air resistance balance each other. The descent speed will remain relatively constant until they safely land on the ground with the help of the parachute.
Overall, the motion of the parachute human involves an initial upward acceleration, followed by a downward acceleration due to gravity, and finally a decrease in speed due to air resistance once the parachute is deployed.