Physics: One possible means of achieving space flight

Subject: Physics / General Physics
Question
One possible means of achieving space flight is to place a perfectly reflecting aluminized sheet into Earth ‘s orbit and to use the light from the Sun to push this solar sail. Suppose such a sail, of area 6.80 104 m2 and mass 6100 kg, is placed in orbit facing the Sun. Ignore all gravitational effects, and assume a solar intensity of 1340 W/m2. (Hint: The radiation pressure by a reflected wave is given by 2 (average power per area)/c.)
(a) How long does it take for this sail to reach the Moon, 3.84 ? 108 m away?

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