The distance versus time graph for Object A and Object B are shown. (3 points) Which object moves with changing speed?

Only Object B, because the graph has straight lines
Only Object A, because the graph starts from the origin
Both Object A and Object B, because the slope of the graph is the same throughout
Both Object A and Object B, because different distances are traveled in the same time interval

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?