7) A soundwave in an unknown material has the displacement form wave function of s(x,t) = (28 nm) sin [(2.31 rad/m) x + (2760 rad/s) t + 0.95 rad]. Find the velocity of the wave.
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- 10.fast as possible pleaseNeed help with 9Problem 4: Speed deamplifier. In the figure above on the right, block 1 of mass m1 slides along an x-axis on a frictionless floor at speed 4 m/sec.Then it undergoes a one-dimensional elastic collision with stationary block 2 of mass m2 = 2m1. Next, block 2 undergoes a one-dimensional elastic collision with stationary block 3 of mass mz = 4m1. What then is the speed of block 3? Answer: 16 m/sec or 1.78 m/sec.