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A sled is pulled upwards and to the right with a constant force of magnitude $F$, as shown above. A second identical sled is pushed downwards and to the right at the same angle below the horizontal with the same force of magnitude $F$ across the same ground.

If both sleds are moving to the right, what can be said about the force of friction acting on the two sleds?

A

The force of friction acting on sled 1 is greater than the force of friction acting on sled 2.

B

The force of friction acting on sled 2 is greater than the force of friction acting on sled 1.

C

The force of friction acting on both sleds is equal.

D

It is impossible to compare the force of friction acting on each sled without more information.

E

The force of friction is not exactly equal, but is so close for both sleds that the difference is negligible.

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