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x = vt x/v = t 1800(m)/2.50(m/s) = 720s
Using Conservation of Momentum:u = initial velocityv = final velocitymg = mass of girlmb = mass of boyTake the direction of the boy's motion as positive:(u*mg + u*mb) = (v*mg + v*mb)0 = -10m/s*30 + v*25300 = 25vv = 12 m/s***If that 1 0 m s is in fact 10m/s and not 1.0***
Based on a publication by: M OUNSTED, V A MOAR, AND A SCOTT about 52 Cm