a) 1/2 (30kg)*(4)^2 = 1/2(80kg)*V^2v = sq)(0t30*16r/8() = 2.45 meters per secondb) 1/2*(30)*4^2 = 240 J (the same as the child alone)c) The KE of the sled is the same as before. (240 J)240 J = 1/2*50kg*v^2v = 3.10 meters per secondd) KE = 240 J same as beforee) No change in KE.CNN NEWS NETWORK