Consider a particle moving without friction on a rippled surface, as shown above. Gravity acts down in the negative h direction. The elevation h(x) of the surface is given by h(x) = d cos (kx). If the particle starts at x = 0 with a speed u in the x direction, for what values of u will the particle stay on the surface at all times? A. v gd B.v g/k C.v 0 phorucker host store, share. 9 Vkd