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July 30, 2014

July 30, 2014

Posted by **Hannah** on Saturday, September 12, 2009 at 1:31pm.

Determine its velocity ->v as a function of time t.

Determine its acceleration ->a as a function of time t.

Determine ->r at time t = 2.5 s.

Determine ->v at time t = 2.5s.

Express your answer using two significant figures. Express your answer in terms of the unit vectors ihat and jhat.

- Physics-calc -
**MathMate**, Saturday, September 12, 2009 at 5:33pmThis is a problem of differentiation where the independent variable is t, and

**r**is the position vector.**v**is the velocity vector.**a**is the acceleration vector.

The motion is described in two orthogonal directions**i**and**j**, which means that you can do the calculations in each of the directions independently of each other.

Given**r**= (3.0t^2**i**- 6.0t^3**j**) m

The**i**and**j**components of the position vector are

Pi(t)=3.0t^2

Pj(t)=6.0t^3

So d(Pi(t))/dt = d(3t²)/dt = 6t

...

can you complete the rest?

Post your answers for a check if you wish to.

- Physics-calc -
**Hannah**, Saturday, September 12, 2009 at 6:56pmWhat it P representing? Position?

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