(b) When its speed is v= 4 m/s, its mechanical energy is 1225mvU+bg. This must equal the energy at the origin: 12512022mvUmvU+=+oso that the speed at the origin is vvmUUo=+−2250ch.Thus, with U(5) = 246 J, U(0) = 0 and m= 20 kg, we obtain vo= 6.4 m/s. (c) Our original formula for Uis changed to Uxxx=− ++8322533in this case. Therefore, U(2) = 11 J. But we still have v
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