1.W=fs=0.2X3.6×10^4N×2×1000m=
2(1)0N 0W
(2)w=FS=20N×35m=700J
P=W/t=700J/10s=70w
3.麻烦,
4.F=Pt=66×10^3w×30/54/3.6s=
sorry,没算,打字不好
1.W=fs=0.2X3.6×10^4N×2×1000m=
2(1)0N 0W
(2)w=FS=20N×35m=700J
P=W/t=700J/10s=70w
3.麻烦,
4.F=Pt=66×10^3w×30/54/3.6s=
sorry,没算,打字不好