Heres a question for you, cant work out what formula to use so i need some help. A mass of 220KG, hits a cylindrical pole into the ground. Just before it hits the velocity of the mass is 10ms-1. The pole is pushed 0.4 m into the ground, when the mass is droped 5m onto the pole. G = 9.8ms-2. Show that the average force exerted by the pole on the mass is 27kN. I just cant work it out! i know its simple but if someone can explain it to me id much appreciate it as ive spent nearly 30 mins on this one question and its only worth 2 marks.. Thanks in advance. Ben.