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Question

A particle moving in a straight line covers half the distance with a speed of 3 ms1. The other half of the distance is covered in two equal time intervals with speeds of 4.5 ms1 and 7.5 ms1, respectively. Find the average speed of the particle during this motion.

Solution
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VavgTDTT=xx2×3+x429+x4215=116+136+130=130+5+6180=18039=4.61m/s

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