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HELP MATH SIMPLIFY THE COMPLEX FRACTION? Aluminum has a density of 171 lb/ft3. what would be its specify gravvity? What is the acceleration of a proton moving with speed of 7.5m/s at right angle to a magnetic field of 1.4T? A kid moving 3.78 m/s jumps on a slip and slide (Uk=0.111). After sliding 5.00 m, what is his velocity? Unit=m/s? What animal walks in the snow print that looks exactly like a very tiny person's shoe print?