Let r(t) = (4sin 21)i + (4cos 2r)j– (e“ )k, be the position of particle in space at time . Find the velocity, speed and acceleration of the particle at -0. Problem 2: (2 marks) A projectile is fired from the origin over the horizontal ground at an initial speed of 900 m/sec and a launch angle of 600 (i) When and how far away will the projectile strike? (i) How high overhead will the projectile be when it is 9 km downrange. Problem 3: (2 marks) Find the curvature for the curve r(t) = (6sin 2t)i + (6cos 2t)j+ 5tk

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