The shape of the displacement versus time graph for a skydiver would be a curve that starts at zero displacement when the skydiver jumps out of the plane, increases as the skydiver falls accelerating due to gravity, and eventually levels off as the skydiver reaches terminal velocity. The curve will then be a straight line at a constant displacement representing the terminal velocity until the skydiver opens the parachute, at which point the displacement will decrease as the skydiver slows down and lands.
The shape of a displacement versus time graph for an object could vary depending on the motion. It could be a straight line for constant velocity, a curve for accelerated motion, zero line for zero velocity, or negative slope for motion in the opposite direction.
In neutral equilibrium, displacement in either direction would not affect the potential energy of the particle, therefore, the graph would be horizontal.
Displacement
If the Object is falling at a constant velocity the shape of the graph would be linear. If the object is falling at a changing velocity (Accelerating) the shape of the graph would be exponential- "J' Shape.
The bullet would either hit or miss the target, depending on how good the aim of the first skydiver was. Since the shooter was in free fall, he would be pushed back and probably begin to rotate rapidly.
To find the density of an irregular shape, you would first measure its mass using a scale. Then, you would need to measure its volume using a displacement method or by using water displacement. Once you have both the mass and volume, you can calculate density by dividing the mass by the volume.
The graph is a straight line whose slope is the acceleration of gravity.
The force on the skydiver is equal to the mass of the skydiver multiplied by the acceleration due to gravity. In this case, the force would be 70 kg * 9.8 m/s^2 which equals 686 N.
Only if they have a heart attack, but not likely.
The acceleration of the skydiver can be calculated using Newton's second law: F = ma, where F is the force of gravity - air resistance, m is the mass of the skydiver, and a is the acceleration. The acceleration will depend on the exact value of air resistance acting on the skydiver.
Terminal airspeed for a skydiver is approximately 120mph (oriented on belly). Mass of the skydiver affects the speed ! So heavier generally falls faster. (drop a ping pong ball versus a golfball) So, the weight of the skydiver will not affect the air resistance. His clothing will affect it, and his body position. Lastly, air pressure changes with altitude, so the density of the air is less as you go higher. So, exit altitude will also be a factor, as the air pressure will change the air resistance due to density. Bet you're sorry you asked. As a skydiving instructor, if I weighed 1/10 my weight, i would expect to fall really slow. something ridiculous, like 30mph. If you made air resistance 1/10th we would get going quite fast. 200-250mph? Col Joe Kittenger jumped form 103,000feet from a balloon. He experienced an almost frictionless descent for a bit, which led people to believe to break the sound barrier.