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# Need help urgently on the following question. ?

Really confused with a and b. I’f someone could help that would be great.

### 1 Answer

- az_lenderLv 71 month ago
This question makes no sense at all. Your teacher is an idiot. What is "x", is it time, or is it a spatial coordinate? "At 2.13 seconds" makes no sense since there is no "t" in the original equation.

If he/she really meant y = 17t^3 - 2t + 2, the speed would be

dy/dt = 51t^2 - 2, so the object would not be in motion

when t = sqrt(2/51).

The speed is dy/dt = 51t^2 - 2, as we said above. Plug in t = 2.13s.

The acceleration is d2y/dt2 = 102t, again plug in t = 2.13s.

But you were never told what units the "y" is being measured in, so you'd still have no idea what to say about the speed and acceleration. Is the speed m/s, ft/s, or leagues per second?

Go to your another math or science teacher at your school to complain about this moron.