Ahorizontal force of 200n is applied to a 55kg cart across a 10m level surface. if the cart accelerates at 2.0m/s^2, then what is the work done by the force of friction as it slows the motion of the cart?

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct