How to Find the Total Distance Traveled from 0 to 10 Seconds?

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SUMMARY

The discussion centers on calculating the total distance traveled by a particle described by the equation s = 0.7t² - 0.1t³ + 0.5t over the interval from 0 to 10 seconds. The user successfully determined the distance from 0 to 5 seconds as 7.5 meters and sought assistance for the interval from 5 to 10 seconds. The correct approach involves finding the time when displacement is zero, which is crucial for accurately calculating total distance, leading to a final distance of 40 meters rather than the incorrect 32.5 meters initially suggested.

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Homework Statement


the following is a equation to find the displacement of a particle. I've found it is instantaneous at rest at t=5. now need to find the distance traveled between 0 to 10s.

i found distance traveling between 0 to 5 s is 7.5

but no idea how to find distance traveled between 5 to 10s...please help.

Homework Equations



s=0.7t^2-0.1t^3+0.5t

The Attempt at a Solution



32.5m
 
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You don't need to know when the velocity is zero to solve this, you need to know at what time T the displacement is zero. Then the total distance traveled is |s(T)-s(0)|+|s(10)-s(T)|.
 
yes i use|s(5)-s(0)|+|s(10)-s(5)| = 7.5+32.5=40but the ans is 40 instead of 32.5
 
That's no good. The displacement isn't zero when t=5.
 
thanks i got the ans but i wonder why we have to know what time the displacement is zero??i can't get it~.~
 
You need to know when the displacement is zero because after that time the displacement becomes negative (and distance is never negative).
 
i get it but i wonder can i do it with find t when v=0? because your method seem not suitable for finding distance between t and t1(where t and t1 are the time when s=0)

can you please point out my mistake in the following equation?

|s(5)-s(0)|+|s(10)-s(5)| = 7.5+32.5=40

thanks a lot:)
 

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