Solve these numericals:- (PLEASE HELP, URGENTLY NEEDED!)
1) A certain force exerted for 1.2 seconds raises the speed of an object from 1.8 metres per second to 4.2 metres per second. Later the same force is applied for 2 seconds. How much does the speed change in two seconds?
2) A body is released from a height of 20 metres. Calculate the final velocity of the body (take g = 10 metres per second square).