Which does a reference point provide? Select two options.
a position from which to measure future distance
I a set of standard units for measuring displacement
I a standard method for evaluating variables
a method for determining the speed of an object
I a way to detect an object's motion

During andrew johnson’s presidency, the radical republicans gained control over policymaking in congress. they had enough power to override any presidential veto. how did the radical republicans use this opportunity? a. they blocked johnson’s weak reconstruction policies by taking charge of the reconstruction plan. b. they extended their support to johnson’s policies for reconstruction of the south. c. they removed johnson from office and took over the task of reconstructing the south. d. they removed all former confederates from office and stopped the south from rejoining the union.