Calculate the distance you will travel if you maintain an average speed of 10 m/s for 40 seconds.

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explanation:

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

c)   sound waves travel through solids like the string.

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