When viewing a scene on a dvd in frame-by-frame mode, how can you tell if an object in the frame is moving?

you dont have to explain just answer. greatly appreciated if answer asap.
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i just did this and got a 100.

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

answer///isobars;