Does it have to be hit extremely hard?
“It depends on the distance from the cue ball to the obstruction, the weight of the cue stick, and how much of the obstruction you need to clear. The cue ball’s path while in the air is a parabola, and you can calculate how fast the ball must be going to just clear the obstruction at the peak of the trajectory.
The most important factor is the kind of cloth on the table. If it is very high quality, thin cloth, jumping will be very difficult. If it is thicker or maybe rubber-backed, jumping will be easy.
Start with an easy drill: Freeze three balls together in a line parallel to and about a foot from a rail. Remove the middle one. Place the cue ball an inch from the rail, and shoot it through the hole.Twenty degrees elevation should be plenty for this shot. Do the same, but place an object ball to be pocketed after the jump. Move the two obstructing balls closer to each other and/or farther from the cue ball.”