person moves from house to a market with velocity of 2.5km/hr.the market is closed then he returns to house with velocity 7.5km/hr. what is avg speed of person with in time of 0-50 min. and avg velocity
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ANSWER:
Average speed = 5km/hr, Average velocity = 0
EXPLANATION:
average speed = total distance/total time
average velocity = total displacement/total time
avg speed = (2.5*25/60) + (7.5*25/60)
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50/60
= (62.5+187.5)/50 {cancelling divided by 60 in both numerator and denominator}
= 250/50
= 5km/hr
displacement = 0
so avg velocity = 0/50
= 0
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