hey guys im having trouble working out this question. be great if ya can help.

 

The position of a golfball is given by r = ((3t^2)i^ + (2t^2-1/6gt^3)J^)m. Calculate its velocity and its acceleration at time t = 1s (assume that g = 10ms^-2

 

i^ = i hat

J^ = j hat

Do you know the definition of velocity and acceleration?

You should explain to us how you are trying to do it.

And do you know you can use calculus (differentiation and integration) to change formulae for either position, speed/velocity or acceleration into each other?

 

For example differentiating the equation for position (actually distance travelled from a point) will give you it's velocity.