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plz help- M2 again
This is an M2 edexcel qs – pg 29, qs 9
At times t seconds the position vector r metres of a particle P, of mass 3 kg is given by
R= (3t^2 +1)I + (24t-2t^3)j
a. find the speed in m/s of P when t=1
b. find the value of t when the velocity of P is perpendicular to j.
I got the first answer but I don’t know how to do the second part, can someone plz help me out?
thanks
At times t seconds the position vector r metres of a particle P, of mass 3 kg is given by
R= (3t^2 +1)I + (24t-2t^3)j
a. find the speed in m/s of P when t=1
b. find the value of t when the velocity of P is perpendicular to j.
I got the first answer but I don’t know how to do the second part, can someone plz help me out?
thanks
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