Chapter 7: Problem 876
A rubber cord catapult has cross-sectional area \(25 \mathrm{~mm}^{2}\) and initial length of cord is \(10 \mathrm{~cm} .\) It is stretched to $5 \mathrm{~cm}\( and then released to project a missile of mass \)5 \mathrm{gm}$. Taking $\mathrm{Y}_{\text {rubber }}=5 \times 10^{8}\left(\mathrm{~N} / \mathrm{m}^{2}\right)\( velocity of projected missile is \)\ldots \ldots .$ (A) \(20(\mathrm{~m} / \mathrm{s})\) (B) \(100(\mathrm{~m} / \mathrm{s})\) (C) \(250(\mathrm{~m} / \mathrm{s})\) (D) \(200(\mathrm{~m} / \mathrm{s})\)