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THe particle starts from rest at position (3,5,-4). What is the poisiton and velocity of the particle at time t= 8 sec.? WHat is the poistion wehn the particle is moving at a speed of 20 ft/sec?

I guess i am confused on how to find the position vector of teh particle at t= 8 sec. I know once i find that i need to subtract it from the orginal position. I then assuem i am going to do an integral? to get the position when the particle is moving at a speed of 20 ft/sec?

HEre is the second problem. I have no idea what to do. I am sure i need to take the derivative of the equation but i dont' know how to apply it.

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