a car travels at 54km/hr for first 20 s, 36km/hr for next 30 s and finally 18 km/hr for next 10 s. Find its average speed.
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Hey mate __
distance =speed *time
so , d=54*5/18 *20 = 15*20= 300 m
d = 36*5/18 *30 = 10*30=300 m
d= 18*5/18 *10 = 50 m
total distance= 650 m
total time = 60 s
AVG speed = 650 / 60 = 65/6 = 10.8 m/s
Hope it helps :)
distance =speed *time
so , d=54*5/18 *20 = 15*20= 300 m
d = 36*5/18 *30 = 10*30=300 m
d= 18*5/18 *10 = 50 m
total distance= 650 m
total time = 60 s
AVG speed = 650 / 60 = 65/6 = 10.8 m/s
Hope it helps :)
Anonymous:
is it correct ?
yes, u r right!!
then plz mark as brainliest :)
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