A rectangular parallelepiped with a square base d = 0.260 m
on a side and a height
h = 0.120 m
has a mass
m = 6.30 kg.
While this object is floating in water, oil with a mass density
o = 710 kg/m3
is carefully poured on top of the water until the situation looks like that shown in the figure. Determine the height of the parallelepiped in the water.

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

elctricity and magnet is conversion to it