Estimate the each part of following question given below:
Question: A man stands at top of 600.00m building and throws 1.50kg mass(1) straight down at a speed of 10.0m/s. A few floors down his friends dopers a 5.0kg mass(2) from 575.00m above the ground at precisely the same time the guy on roof throws his mass down. Neglecting air friction
Part 1: How much time elapses before the two objects meet?
Part 2: Where do they meet?
Part 3: What is the speed of first object when they meet?
Part 4: What is the speed of second object when they win?
I need help to solve the above question.