When each metal is hit with light at the minimum wavelength (see question #1) can you vary the intensity of the light to start emitting electrons?

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy