Posted by meer on Thursday, November 11, 2010 at 8:53am.
There is not much explaination to do, it is a vector equation.
using i,j coordinates
v(t)=vi+at=0i+9j +(-2t i)+ (-4t j)
put in t=1, and solve. velocity in the i direction will be let me see
v(1)i=-2 m/s
check that.
0i come from where ?
Also,9-2-4=3 !!
i,j are unit vectors, in different directions. Oi means zero in the i direction, as in the initial velocity given.
You cannot 9-2-4 as those were in different directions.
Surely this is in your textbook.
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