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V = 100 i + 50 j
• Vx = 100 m/s
• Vy = 50 m/s
• X = Vx•t = 100•4 = 400 m
• Y = Vy•t - 1/2 g t^2 = 50•4 - 1/2 (10)(4^2) = 120 m
r = (400 i + 120 j)