A particle moving in a straight line covers half the distance with ...

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A particle moving in a straight line covers half the distance with speed of \( 12 \mathrm{~m} / \mathrm{s} \). The other half of the distance is covered in two equal time intervals - with speed of \( 4.5 \mathrm{~m} / \mathrm{s} \) and \( 7.5 \mathrm{~m} / \mathrm{s} \) respectively. - The average speed of the particle during this motion is :
(1) \( 8.0 \mathrm{~m} / \mathrm{s} \)
(2) \( 12.0 \mathrm{~m} / \mathrm{s} \)
(3) \( 10.0 \mathrm{~m} / \mathrm{s} \)
(4) \( 9.8 \mathrm{~m} / \mathrm{s} \)
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