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**DKoK** ok, im doing a course in Architectural Technology and we were required to do a Maths Module, however i failed it, and now have to do coursework resit.

i have most of the questions in the new piece of coursework, but there is 1 question that I cannot work out....neither can my Father, or my Brother's Girlfriend.

so if anyone can help please do...

the question is

"The distance, x, in meters, of a particle from an origin 0 at time t seconds is given by,

x= 1/3t (cubed) - 4t (squared) + 15t - 2

at what time(s) is the particle at rest?

(a) t= -3 seconds and -5 seconds

(b) t= -2 seconds

(c) t= 1 seconds and t= 2 seconds

(d) t= 2 seconds

(e) t= 3 seconds and 5 seconds"

plus if there is any chance you can show me how it is worked out would also help me to understand it for the next time i come across this sort of question.

sorry if this is too basic a question to be placed here in the university section...but i didnt know where else to put it