Question

what is the speed of sound in vulcanised rubber ?

Answer 1

Speed of sound in Rubber  is 60 m/s

Answer 2

here it's your answer
Speed of sound in rubber using the above formula = 57.7 m/sec. This is much smaller than the speed of sound in air, which is 340 m/sec at atmospheric pressure/Temperature. For vulcanized rubber the Young's modulus Y = 2.8 * 10⁶ N/m² and the density = around 920 kg/m².