Mr. Sul is driving his car at 20 m/s along the highway for 10 seconds . He wants to pass a car up , so for the next 5 seconds he accelerates 2 m/s² .He holds this new velocity for another 10 seconds . What is his velocity ? ( Show all work )​

Why do atoms emit energy of only specific wavelengths

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.

Arope has one end tied to a vertical support. you hold the other end so that the rope is horizontal. if you move the end of the rope back and forth with a frequency of 4 hz, the transverse wave you produce has a wavelength of 0.5 m. what is the speed of the wave in the rope?