Four objects (A, B, C, & D) make up a closed system. The table below shows their energy at various points in time. Fill in the empty cells in the table. t=0 s t = 7 s t = 12 s t = 14 s t = 15 s EA (J) X EB (J) Ec (J) ED (1) Etotal (J) 63 Part 3: Power 36 26 33 6 30* 0 141 30 13 3 80* 41 Part 2: Positive, Negative, or Zero Work from Velocity & Force Vectors For the given velocity vector, which of the following force vectors will do POSITIVE work? Choose all that apply. Velocity vector 56 20 30* 20* Force vectors 87 40 61 20* 3 Determine how long it will take a 1890 kg vehicle with a 61 kW engine to accelerate from rest to 39 m/s. At = 11.78s 30* 40 O