Electrons are accelerated in a Television tube through a potential difference of about 10 kV. Find (i) the highest frequency of the EM waves emitted, when these electrons strike the screen of the tube (ii) what kind of waves are these? ​

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.