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A particle moves for 20 seconds with velocity $3 \mathrm{~m} / \mathrm{s}$ and then velocity $4 \mathrm{~m} / \mathrm{s}$ for another 20 seconds and finally moves with velocity $5 \mathrm{~m} / \mathrm{s}$ for next 20 seconds. What is the average velocity of the particle
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The correct answer is:
4 m/s
Time average velocity $=\frac{v_1+v_2+v_3}{3}=\frac{3+4+5}{3}=4 \mathrm{~m} / \mathrm{s}$
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