In a mass spectrometer, the electric field between the plates of the velocity selector is 2 x 105 V/m, and the magnetic field is 2.0 T. You are trying to find the mass of a new singly charged positive ion. You discover that a stream these ions, after passing through the velocity selector, moves in a circular path with radius 30.0 cm in the magnetic field. (a) What is the speed of these ions just after passing through the velocity selector

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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