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18. One day on a spacecraft corresponds to 2 days on the earth. The speed of the spacecraft relative to the earth is

(a) 1.5 x 10 ^ 8 ms ^-1                   (b)  2. 1 x 10 ^8 ms ^-1

(c) 2.6 x 10 ^ 8 ms ^ -1                     (d) 5.2 x 10 ^8 ms^-1

Ans. c

(23)

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