9. A person throws a ball from height of 6 feet with an initial vertical
velocity of 48 feet per second. Use the vertical motion model,
h = -16t^2+vt + s, where v is the initial velocity in feet per
second and s is the height in feet, to calculate the amount of time
the ball is in the air before it hits the ground again. Round your
answer to the nearest tenth if necessary
Time in air seconds
Enter the answer

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.