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3. Calculate the magnitude (VR) and direction () of the sum of the following three vectors given in the diagram below. (Vi = 120,01 = 37°), (V2 = 50, 8, = 48°) and (V3 = 40,0= 20°) A) Vr = 87.5, o = 33.8° above the +x-axis B) VR 71.5, O = 31.0° below the +x-axis C) VR = 72.7, o = 26.1° below the +x-axis D) VR=99.5. 0 = 14.6° above the +x-axis E) VR = 63.5, o = 18.6° below the +x-axis 4. Which of the following statements are true about an object in two-dimensional projectile motion with no air resistance? A) The speed of the object is constant but its velocity is not constant. B) The speed of the object is zero at its highest point. C) The acceleration of the object is +g when the object is rising and -9 when it is falling, D) The horizontal acceleration is always zero and the vertical acceleration is always a non-vero con- stant downward. E) The acceleration of the object is zero at its highest point.