A constant force acts for \( 3 \mathrm{~s} \) on a mass \( 16 \mathrm{~kg} \) and then ceases to...

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A constant force acts for \( 3 \mathrm{~s} \) on a mass \( 16 \mathrm{~kg} \) and then ceases to act. During the next \( 3 \mathrm{~s} \), the body covers \( 81 \mathrm{~m} \). Find the magnitude of the force. Take \( g=9.8 \mathrm{~m} / \mathrm{s}^{2} \).
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