A ball is thrown vertically upward from the top of a building 144 feet tall with an initial velocity of 128 feet per second. The distance s​ (in feet) of the ball from the ground after t seconds is s=144+128t−16t2.   ​(a) After how many seconds does the ball strike the​ ground?   ​(b) After how many seconds will the ball pass the top of the building on its way​ down?       Question content area bottom Part 1 ​(a) After how many seconds does the ball strike the​ ground?   t=enter your response here   seconds   Part 2 ​(b) After how many seconds will the ball pass the top of the building on its way​ down?   t=enter your response here   seconds

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Displacement, Velocity and Acceleration

In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.

Linear Displacement

The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.