A stretched rubber band when released regainsits original length

A stretched rubber has

A wire of circular cross-section and 25 Ω resistance is uniformly stretched until its new length is three times the original length. Find its resistance.

The length of a wire is l_A when the tension in it is T_A and of another wire is l_B when the tension is T_B . The original length of the wire is

Length of an elastic string is x then tension 5N is applied and its length will be y when tension 7 N. What will be its original length ?

A rubber cord has a cross -sectional area 1 mm^(2) and total unstretched length 10.0cm . It is streched to 12.0 cm and then released to project a missile of mass 5.0 g.Taking young's modulus Y for rubber as 5.0xx10^(8) N//m^(2) .Calculate the velocity of projection .

Choose correct alternative. A wire of resistance 20 Omega is uniformly stretched to thrice its original length. The length change in its resistance is

The ratio of the lengths of two wires A and B of same material is 1 :2 and the ratio of their diameters is 2:1. They are stretched by the same force, then the ratio of increase in length will be