Suppose 2 waves, identical except for the direction of travel, approach each other in a medium that obeys hookes law. At certain instants, the waves interfere constructively at all positions. suppose that the kinetic energy in eash of the initial waves is K, determine the kinetic energy that results from the superposition of both waves.

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i just did this and got a 100.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

answer: 31, 5556. 952 seconds