After the jumper goes faster than terminal velocity, the air resistance force is greater than the weight so that the acceleration is in the positive direction. The greatest positive acceleration ...

I used an air resistance that was proportional to the square of the velocity. Using data from wikipedia , I have a coefficient of drag that changes with the bullet speed - based on radar data.

The air resistance can be modeled as: Where: ρ is the density of the air. ... If I use a terminal velocity of 12.2 m/s, the stopping acceleration goes down to 250 g’s.

As they speed up, the air resistance increases until the two forces are balanced, so they eventually reach a maximum speed and don’t go any faster. This is their terminal velocity.

In fact, terminal velocity gives you a nice conceptual explanation of why spacecraft engineers have to work so hard to dissipate the tremendous heat generated by craft falling back to Earth.

Using drizzle detectors, researchers discovered tiny raindrops falling more than 1.3 times as fast as terminal velocity, the speed at which air resistance cancels out gravitational pull.

It will be traveling much slower than when it was first fired, as its terminal velocity (due to air resistance) is far lower than the initial muzzle speed. But even so, ...

Hatcher calculated that his .30-caliber rifle bullets reached terminal velocity—the speed at which air resistance balances the accelerating force of gravity—at 300 feet per second.

The iPhone may have tumbled as it fell, so it countered stronger air resistance, he said. He estimated that the phone's velocity “wasn’t all that fast – probably less than 100 miles per hour ...