There is a 100N object on the rough horizontal ground, which moves forward at a constant speed of 10m in 10s with 20n horizontal tension A. The power of gravity is 100wb. The power of supporting force is 100wc. The power of pulling force is 200wd. The power of pulling force is 20W

There is a 100N object on the rough horizontal ground, which moves forward at a constant speed of 10m in 10s with 20n horizontal tension A. The power of gravity is 100wb. The power of supporting force is 100wc. The power of pulling force is 200wd. The power of pulling force is 20W

The direction of gravity is vertical downward, the object moves horizontally, there is no moving distance in the direction of gravity, so gravity does not work, the power of gravity is 0, so a is wrong; the direction of supporting force is vertical upward, the object moves horizontally, there is no moving distance in the direction of supporting force, so the supporting force does not work, the power of supporting force is 0