It could be both, most likely putting books into your backpack
If the backpack is being carried at a constant speed, there is no change in velocity, which means there is no net force acting on it. Since work is the result of a force acting over a distance, and no force is causing the backpack to accelerate or decelerate, no work is being done on the backpack.
Snowmobiling.
Snomofear
not enough
D=1.250m.
The work done on a 25 kg backpack when you walk 100 m horizontally depends on the force needed to move the backpack and the distance you carry it. Without knowing the force applied to move the backpack, we cannot calculate the work done. Work is defined as force multiplied by distance in the direction of the force, so we need this additional information to provide an accurate answer.
You have to be licences!
yes
Somewhere near the Equator.
Backpack
Swiss gear is great