An object is dropped from rest and allowed to fall for several seconds. Measurements or speed seconds and 4 seconds to make a comparison, Compared to the speed at 2 seconds, the speed of the object at 4
seconds
A)) one-halfas great
() two times as great
E) the same
Hone-fourth as great
D) four times as great

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.