1.

A ball is dropped from rest from the top of a building and strikes the ground with a speed vy From ground level, a second ball is thrown straight upward at the same instant that the first ball is dropped. The initial speed of the second ball is vo = v, the same speed with which the first ball eventually strikes the ground. Ignoring air resistance, decide whether the balls cross paths (a) at half the height of the building, (b) above the halfway point, or (c) below the halfway point. O (a) O (b) O (c)When can the equations of kinematics be used to describe the motion of an object? O They can be used only when the object has variable velocity. O They can be used only when the object is undergoing constant acceleration. O They can be used only when the object has constant velocity. O They can be used only when the object is undergoing variable acceleration.What is the difference between distance and displacement? O There is no difference between the two concepts; they may be used interchangeably. O Displacement is a vector, while distance is not a vector. O Distance is a vector, while displacement is not a vector