Answer
By F = -kx {-ve just indicating the sign of the force}
=>35 = k x (85-50) x 10^-2
=>k = 100 N/m
Again by F = -kx
30 km/h * 17 h = 30*17 km/h *h
= 510 km
Answer: the waves travel in an horizontal direction while the strings vibrate in a vertical direction.
