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April 18, 2015

April 18, 2015

Posted by **rav** on Saturday, July 15, 2006 at 1:05pm.

The particle is initially at a position given by vector 2i+j

iv calculated the cartesian components of F1 and F2

F1 = 3i+6j

F2 = i 2j

iv also calculated the cartesian component of the total force F1+F2 = (3i+6j)+(i-2j) = 4i +4j

however the part im struggling on is that now the particle is of mass 1kg and is initially at rest, i have to use newtons 2nd law to write down an equation of motion and find the position of the particle after 1second.

so far iv tried:

F=ma

F1+F2= 1a

therefore a = 4i+4j but then i dont know how to find the new posistion ...can anyonehelp thankz

where acceleration= force/mass, and you have force and mass.

all the above of course is a vector equation, not messy at all. You can work the i,j components as separate equations, as the system is orthogonal. If needed, I can critique your work.

thankz iv worked it out

Assuming you have calculated the "a" vector correctly, just multiply it by t^2 to get the vector position change at time t. You do not have to add a term for (initial velocty vector) times t,, because the mass was initially at rest.

Add the position change vector to the initial position coordinates to get the new location.

I forgot about the factor (1/2) when calculating the position change due to acceleration. Bob Pursley's answer, posted just before mine, is correct

I have no clue.

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