How do i solve number 2? can someone ?

The rock is kicked horizontally off the cliff at 20 m/s.  

There's no air resistance, and gravity has no effect on horizontal motion.  There's no horizontal force acting on the rock to make it move horizontally slower or faster than 20 m/s, so it keeps moving horizontally at 20 m/s.

It's in the air for 7 seconds before it hits the ground.  Moving horizontally at 20 m/s for 7 seconds, it sails (20 x 7) = 140 meters horizontally away from the cliff.

the answer would be   dignified - apex