a particle moves in a straight path with different velocities 20kmph in 5sec, 40kmph in 10 sec, 60kmph in 15sec. calculate average velocity
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average valocity=total time taken/total distance
=d=20/5=4km,d=40/10=4km, d=60/15=4km
total distance=4+4+4=12km
total time=30second
av.velocity=12/30/60=12×2=24km/h
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