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A cyclist rides 30 km at an average speed of 9kmhr At what rate must the cyclist cover the next 10 km in order to bring the overall average speed up to 10kmhr?

Anonymous

∙ 17y ago

Updated: 4/28/2022

In all he will cover 40 km. To do so at an average speed of 10 kph means his total journey will take 4 hours. He has taken 3hr 20 min for the first part (30km @ 9kph), so he has 40 min to cover the final 10km. Required speed is therefore 10 x 60/40 ie 15 kph.

Wiki User

∙ 17y ago

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A motorcyle goes from 30kmhr to 9kmhr in 2 s what is its acceleration?

The motorcycle averages a negative 10.5 kmphacceleration. That is, the bike decelerates from 30 kmph to 9 kmph in 2 seconds. That's a change of 21 kmph over a period of 2 seconds, and that change is negative. The 21 kmph over a period of 2 seconds represents a 10.5 kmph change every second. Note that acceleration is a vector quantity. It has both magnitude anddirection. We "fudged" here and assigned a "direction" based on the direction is it traveling. It's not a biggie, but do not make the mistake of leaving off a vector when considering a velocity (which is speed plus a direction vector) or acceleration, like in this problem.

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