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The velocity of a particle moving with constant
P acceleration at an instant \( t_{0} \) is \( 10 \mathrm{~m} / \mathrm{s} \). After 5 seconds

W of that instant the velocity of the particle is \( 20 \mathrm{~m} / \mathrm{s} \). The velocity at 3 second before \( t_{0} \) is:
(1) \( 8 \mathrm{~m} / \mathrm{s} \)
(2) \( 4 \mathrm{~m} / \mathrm{s} \)
(3) \( 6 \mathrm{~m} / \mathrm{s} \)
(4) \( 7 \mathrm{~m} / \mathrm{s} \)
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