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All Mechanics DOUBTS HERE!!!

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astarmathsandphysics:
Am looking at this now

astarmathsandphysics:
I got 1.926 and I cant post my working until my scanner recovers from the thumping I gave it

WARRIOR:

--- Quote from: astarmathsandphysics on March 01, 2012, 08:00:29 pm ---I got 1.926 and I cant post my working until my scanner recovers from the thumping I gave it

--- End quote ---
This is from the M2 Edexcel book . Page  18  ,Exercise 1B question 10 ! 

The answer at the back
a)7
b)1,5
c)48m

Thanks anyway !

astarmathsandphysics:
I didn't get a  b or c
Check you have the correct page

WARRIOR:
At time t seconds , the force F newtons acting on particle P, of mass 0.5 KG , is given by
F= ( 3t ) i  + (4t-5)j .

When t=1 , the velocity of P is 12 i m/s
Find velocity of P after t seconds
The angle the direction of motion of p makes with i when t=5 .


also i woudl like to know , when the question says for example
Find t when v is paraller to i . This means j = 0
but when he says i+j or i-j , what does this mean?
 Gradient = 1 and gradient = -1

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