work done is = to force multiply by displacement
here force is = 1000x10 N
and dispacement is 75m
= 75x104
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1400j
700 x 4 = 2,800 newton-meters = 2,800 joules
78*6*9.8 N = 4586.4 N
1000
1000 m in a KM Kilo means 1000 so kilometer is 1000 meters :)