Domino toppling is an event in which a large number of dominoes are lined up close together and then allowed to topple, one after the other. the disturbance that propagates along the line of dominoes is a)partly transverse and partly longitudinal
b)transverse
c) longitudinal

A)partly transverse and partly longitudinal

Explanation:

A longitudinal wave is one in which the motion of the particles of the medium is parallel to the direction of propagation of the wave, while in a transverse wave the motion of the particles is perpendicular. In this case the dominos move both horizontally and vertically. So, the disturbance along its line has both components.

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft