Light impinges on a metal which has a work function of 2.0 eV, and electrons are
emitted with velocities up to a maximum of 6000000 m/s.
(a) What is the frequency of the light?
(b) What is the minimum frequency of light needed to produce any photoelectrons?

Acar traveling at a constant speed of 22.0 m/s passes a trooper hidden behind a billboard. one second after the speeding car passes the billboard, the trooper sets off in chase with a constant acceleration of 3.50 m/s2. how long does it take the trooper to overtake the speeding car? solve this problem by a graphical method. on the same graph, plot position versus time for the car and the trooper.