The force F$1=20$ N of the driver foot on the brake pedal moves piston X$.$ The space between

position X and Y is filled with oil which cannot be compressed. The force F$2$

exerted by the oil

moves piston Y$.$ The area of the crossection of piston X is $4\mathrm{.}8$ cm$2$

$.$ Determine the force F$2$

if the

piston Y has a diameter $4$ times the diameter of piston X