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 cellphone, they would then know if the killer would have contacted them or always hated them. or if it was a breakup. but if that is not the case, then it would be the clothing. to put in a bullet, it would have to be put in by hands. hands have finger prints which, would have giving you the answer of who done it.

explanation: