Suppose the position of an object is given by a vector

[sunnyday]

Homework Statement

Suppose the position of an object is given by r⃗ = (3.0t2i^ - 6.0t3j^)m. Where t in seconds.

Determine r⃗ at time t = 2.5 s. Express your answer using two significant figures. Express your answer in terms of the unit vectors i^ and j^.

Homework Equations

plugging in 2.5 seconds to the r equation

The Attempt at a Solution

r = 3(2.5)^2i-6(2.5)^3j -> 18.75i-73.002j -> 19i-73j

When I put this answer in my homework, it says it's wrong. I even tried (19i-73j) and it says it's wrong.

 

[haruspex]

6(2.5)^3

Yes.

73.002

No.

 

[sunnyday]

Yes.

No.

oh what. nvm. that was so weird. thank u so much!