A car moves with a speed of 30km/h for half an hour,25km/h for one hour and 40km/h for two hours.calculate the average speed of the car.
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6
I don't know
this anwer but I did in grade six so I don't know but I think someone else can help you
this anwer but I did in grade six so I don't know but I think someone else can help you
Answered by
5
Average speed = total displacement/total time taken
So...
Case I -
S = 30km/h=8.3m/s
,d=?,
t=30 mins
So ...
S= d/t
D=st = 8.3 × 30 × 60 = 1494 m
Similarly...
In case II , it covers 24840 m
And in case III... It covers 80064 m
Now...
Average speed = total displacement/total time taken
=1494+24840+80064/180+3600+7200
=106398/4500
=23.644 m/s
So...
Case I -
S = 30km/h=8.3m/s
,d=?,
t=30 mins
So ...
S= d/t
D=st = 8.3 × 30 × 60 = 1494 m
Similarly...
In case II , it covers 24840 m
And in case III... It covers 80064 m
Now...
Average speed = total displacement/total time taken
=1494+24840+80064/180+3600+7200
=106398/4500
=23.644 m/s
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