A child drops a toy car from a window. The toy car strikes the ground in one second. The child then drops a toy airplane from the same window. What is the velocity of the toy plane the instant
before it hits the ground? (As usual, ignore air resistance.)
REAL ANSWERS PLS EMEEGENCY

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.