14.) A particle moving in a straight line covers half of the total distance with a speed of 3 m/s. The
other half of the distance is covered in two equal time intervals with speeds of 4.5 m/s an
7.5 m/s. The average speed of the particle during this motion is
(1) 4.0 m/s
(2) 5.0 m/s
(3) 5.5 m/s
(4) 4.8 m/s
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