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7) A spacecraft starts from rest, and makes a journey to a destination 494000 km from...

7) A spacecraft starts from rest, and makes a journey to a destination 494000 km from its starting point. It does so by accelerating at a constant rate of 7.42 m/s^2 up to the midpoint of the journey, and then decelerates at the same constant rate of 7.42 m/s^2 for the second half of the journey, ending at rest. How long did the entire journey take?

A)3 hr 12 min

B)18 hr 30 min

C)9 hr 15 min

D)4 hr 32 min

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