1 . The position of a particle Is given by the following expression. where t is time measured in seconds: r(t) = [(2.00 misl + (4.00 m)j + [(6.00 mis)z']|t. (a) i.iii'hat is the magnitude of the velocity. in mis. of the particle at t= 2.00 s? (b) What angle. in degrees. does the velocity of the particle make with the x axis at t = 2.00 s? (c) What is the magnitude of the particle's acceleration. in mlsz? 2. A student throws a water balloon with speed v0 from a height h = 1.50m at an angle 6' = 30 above the horizontal toward a target on the ground. The target is located a horizontal distance d = 10.0 m from the student's feet. Assume that the balloon moves without air resistance. Use a Cartesian coordinate system with the origin at the balloon's initial position. Determine the magnitude of the balloon's initial velocity. v0. in meters per second