1 Harry is now totally panicked about the second task, since neither he nor Hermione can figure out how Harry can breathe underwater. 2  The night before the task, Fred and George show up with a message from Professor Dumbledore for Hermione and Ron. The night before the task, Fred and George show up with a message from Professor Dumbledore for Hermione and Ron. 2  Professor Dumbledore needs them for something. 3  Harry just keeps reading and reading, hoping  next book ... in the next one ... the next one  (26.72). 4  Finally, he nods off without realizing it.
The net force on the object then, is zero, and the result is that the velocity of the object remains constant. Terminal velocity is the highest velocity attainable by an object as it falls through a fluid (air is the most common example, but the concept applies equally to any fluid). It occurs when the sum of the drag force (Fd) and the buoyancy is equal to the downward force of gravity (FG) acting on the object.
When it hits the ground it goes from terminal velocity to zero, decelerating at a rate of v/t where v is terminal velocity and t is the time in-between impact and coming to a complete stop (usually very little time) making the force F=(v/t)*m.