(a) A soccer player kicks a rock horizontally off a 44 m high cliff into a pool of water. If the player hears the sound of the splash 3.16 s later, what was the initial speed given to the rock (in m/s)? Assume the speed of sound in air is 343 m/s. 11.909 X The time given in the problem can be divided into two intervals: the time for the rock to hit the water and the time for the sound to return to the kicker. m/s (b) What If? If the temperature near the cliff suddenly falls to 0°C, reducing the speed of sound to 331 m/s, what would the initial speed of the rock have to be (in m/s) for the soccer player to hear the sound of the splash 3.16 s after kicking the rock? m/s Need Help? Read It Watch It

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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.