1. 2. If the initial velocity in horizontal direction of a projectile is unit vector i and the equation of trajectory is y = 5x(1-x). The y component vector of the initial velocity is A disc of mass 1kg and radius R is free to rotate about a horizontal axis passing through its centre and perpendicular to the plane of disc. A body of same mass as that of disc is fixed at the highest point of the disc. Now the system is released, when the body comes to the lowest 3. position, its angular speed will be -rad s where x = 3R In an experiment to determine the Young's modulus of wire of a length exactly 1m, the extension in the length of the wire is measured as 0.4mm with an uncertainty of 0.02mm when a load of 1kg is applied. The diameter of the wire is measured as 0.4mm with an uncertainty of 0.02mm. The error in the measurement of Young's modulus (AY) is found to be x x 1010 Nm 2. The value of x is (take g = 10 ms 2)