4 A transverse wave along a string is given by Y=2sin(2r(3t-x)+pie/4), where x nady are in cm and 't' is - Physics - Electromagnetic Waves

Question

4 A transverse wave along a string is given by
Y=2sin(2r(3t-x)+pie/4), where x nady are in cm and 't' is in a
second The acceleration of a particle located at x=4cm at t=1s is
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Peter Fernandes · Accepted Answer

Understand the following:
For a general wave equation:
y=asinkx-ωtvwave=dxdt=ωkvparticle=-ωacoskx-ωtaparticle=-ω2asinkx-ωt

Please provide the equation as there is one more variable 'r' which
is undefined

4.A transverse wave along a string is given by Y=2sin(2r(3t-x)+pie/4), where x nady are in cm and 't' is in a second.The acceleration of a particle located at x=4cm at t=1s is -----------