Pulling/force/friction problem/throwing problem

[Gary531]

These are supposed to be so easy, but I still don't get them!

 

[N-Gin]

What exactly don't you get? We can't help you if you don't show us your work! Generally, the first one involves Newton's laws (also look for the forces on the body). The second one involves some simple 2D kinematics (look for topics on projectile motion).