A boy stands at the edge of a bridge above a river. In both of the following scenarios, a stone is thrown over the edge of the bridge by the boy at a speed of 12.0 m/s and leaves his hand at exactly 20.0 m above the surface of the water. (a) If he throws the stone straight up first, how long does it take to hit the water? (b) If he throws the stone straight down, how long does it take to hit the water? (Use kinematic equations to solve.)
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.
A boy stands at the edge of a bridge above a river. In both of the following scenarios, a stone is thrown over the edge of the bridge by the boy at a speed of 12.0 m/s and leaves his hand at exactly 20.0 m above the surface of the water. (a) If he throws the stone straight up first, how long does it take to hit the water? (b) If he throws the stone straight down, how long does it take to hit the water? (Use
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