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
(25)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)