b. kinetic energy depends both on mass and speed.
explanation : given that,
arm length = 8.50 meters
wavelength = 658 nm
number of fringe = 1
we know that,
formula of the speed is
now, put the values
hence, this is the required solution.
as we know that power is defined as rate of work done
so we will have
so in order to increase the power as per above formula we know that either we need to increase the work or we need to decrease the time to complete that work
so here the correct answer will be
increase the work being done or decrease the time in which the work is completed.