Hi croatia_guy ! Welcome to PF!Hey guys, next week I'm writing a very important test, so it would really help me if someone could solve the exercises. Here it is:
(btw, the little number is called the "index" … you can make it little, like this, by using the Size tool on the Reply page)1. A 20-kg stone is thrown downwards at 12 m/s from the top of the ESB. The ESB is 450 m high. The force of air Friction is 120 N. Find the impact velocity of the stone to the ground.