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Anonymous, how would I enter that in the boxes?....see below thanks

thanksThe velocity of a subatomic particle moving through space can be modeled by

v(t)=0.1t^2 −2t +0.2

for t≥0 where t is time in seconds and v is velocity in m/s.
Find the following:

a) (a) The time(s) t at which the particle is not moving:
......... and .........

b)The interval(s) over which the particle is moving forward: (Remember to write union as U and infinite as INF) ..................

c)The interval(s) over which the particle is moving backwards: (Remember to write union as U and infinite as INF) ..................

Thanks!

I know A is The time(s) t at which the particle is not moving: 0.10 and 19.90

I know B is [0, 0.10) U(19.90, INF)
But:
I thought C would be (-0.10, 19.90) but it says wrong..
Thank you

Jonathan
5 hours ago
The equation is only applicable at positive t.
-0.10 is not allowed
0.10 < t < 19.90 is when it is in reverse

Anonymous
4 hours ago
Anonymous, how would I enter that in the box...(I think there are two numbers which need to be separated by a comma)

thanks

2 answers

Sorry, I have no idea how the boxes work.
You put the answer in the box like this, and in this form, (0.10, 19.90). Thank you, but it said it was wrong. The teacher gave an example and put a negative in front...he said that when it is moving backward it is in the negative area of the graph?