Pam's family is clearing some land, and there is a large boulder sitting on top of the ground. Even with the entire family pushing on it, they cannot mov
it. Which type of friction exists between the boulder and the ground
I believe the answer to this question is d , I believe this as the question doesn't explain properly the surface under the boulder. it is questionable as the question is not clear though I believe this as there must be friction under the boulder stopping it from moving.
