A rock is dropped from the top of a 45-meter tower and at the same time, a ball is thrown from the top of the tower in a horizontal direction. Air resistance is negligible. The ball and the rock hit the level ground a distance of 30 meters apart. The horizontal velocity of the ball is most nearly: A) 5 m/s B) 10 m/s C) 14.1 m/s D) 20 m/s E) 28.3 m/s
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.
21. A rock is dropped from the top of a 45-meter tower and at the same time, a ball is thrown from the top of the tower in a
horizontal direction. Air resistance is negligible. The ball and the rock hit the level ground a distance of 30 meters apart. The
horizontal velocity of the ball is most nearly:
A) 5 m/s
B) 10 m/s
C) 14.1 m/s
D) 20 m/s
E) 28.3 m/s
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