Acar is idling at a stoplight. when the light turns green, the car takes 12 seconds to accelerate to 18.7 m/s. what is the average acceleration of the car?

0.64 m/s2

1.6 m/s2

−0.64 m/s2

−1.6 m/s2

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.