Can anyone solve this... "shape of a string" puzzle? Let's say there is an infinite massless and elastic string, which laid horizontally and one of the ends is extended to infinite distance. The string is "pulled" thoroughly and somehow, so that there is a tension T along it. There is a CONSTANT force F acting upwards on the other end(at the POINT) , which will then "drag" the nearer part of the string upwards. My question is simple, What will be the wave profile(or the shape of the wave) after a duration t? Is it a curve.....or is it a combination of 1 section of slope string and 1 section of horizontal string? The horizontal section of the string "haven't experience the force yet." Assume there is no other force other than F. The force F ONLY acts at the "end-POINT" of the string. Welcome anyone who like to accept challenge. Thanks. Twukwuw.