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A Spacecraft Is Measured by a Scientist on the Ground 2.4×108 m/s2.4 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s }

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A spacecraft is measured by a scientist on the ground to have a length of 81 m as it flies overhead with a speed 2.4×108 m/s2.4 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } The spacecraft then lands and its length is again measured by the scientist at rest on the ground. What result does he now get for the length of the spacecraft? (c = 3.0 × 108 m/s)

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