In your circuit toolbox, you only have a collection of resistors ( =100 ω, =20 ω, =10 ω) and some switches that can be open or closed. construct a circuit filling in all four boxes, such that the equivalent resistance between a and b is 8 ω.

This isn't possible to do if we can't see where the four boxes lie within the circuit.

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