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A glow worm of mass 5.0 g emits red light (650 nm) with a power of 0.1 W. entirely in the backward direction. What velocity would it accelerate to after 10 years, if released in free space (and assumed to be alive)?

(a) 9.14 ms-1 

(b) 28.08 ms-1

(c) 11.05 ms-1

(d) 21.04 ms-1