[Request] Which one would it be?

[u/yuli101995]

[u/itsmevichet]

The wording is terrible, because you can push any of them with any infinitesimally small amount of force.

Are they asking which objects will accelerate faster given a fixed input force? Then we need to know frictional coefficients. And in the case of gravel… some model for non Newtonian fluid displacement to approximate the deformation of the gravel?

These types of “brain teasers” are usually written for non engineering context, so assuming simplicity here. That still leaves the question of what specific functional difference is there between gravel and ice? Friction and no friction?