1. The problem statement, all variables and given/known data Three wires are made of same materials. Which wire will have the greatest elongation? wire1: length: 50cm, diameter: 0.5mm wire2: length: 100cm, diameter: 1mm wire3: length: 300cm, diameter: 3mm 2. Relevant equations 3. The attempt at a solution I know, the wire having greatest elongation will have the greatest Young's modulus. So, i have to calculate the young modulus from the given data of the three wires. but I cant get a equation to put. actually i'm weak at the elasticity related issues, but I guess It's not too hard.... 1. The problem statement, all variables and given/known data The escape velocity from earth is v. if the body is projected from the earth in a direction of 45 degree to the vertical then it's escape velocity is?? 2. Relevant equations 3. The attempt at a solution I think, the escape velocity will not change...it's same for all direction....am I wrong?