One part of this problem has me confused....id appreciate any guidance. I have part (a) and (b) but (c) and (d) are TOTALLY losing me. i don't even know where to begin. THANKS "An electron's position is given by r=3.00t i - 5.00t^2 j + 3.00 k, with t in seconds and r in meters" (a) In unit-vector notation, what is the electron's velocity v(t)? My answer: 3.00 i - 10.0t j+ 0.00 k (b) What is v in unit-vector notation at t=6.00s? My answer: 3.00 i - 60.0 j+ 0.00 k (c) What is the magnitude of v at t = 6.00 s? (d) What angle does v make with the positive direction of the x axis at t = 6.00 s? Thank you.