A football running back rushes 13 m straight down the playing field in 2.1 s (in the positive direction). He is then hit and pushed 3.5 m straight backwards in 1.95 s. He breaks the tackle and rushes straight forward another 21 m in 4.2 s. Part (a) Calculate the running back's average velocity in the horizontal direction during the first interval, in meters per second. Part (b) Calculate the running back's average velocity in the horizontal direction during the second interval, in meters per second. Part (c) Calculate the running back's average velocity in the horizontal direction during the third interval, in meters per second. Part (d) Calculate the running back's average velocity in the horizontal direction for the entire motion, in meters per second.
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 football running back rushes 13 m straight down the playing field in 2.1 s (in the positive direction). He is then hit and pushed 3.5 m straight backwards in 1.95 s. He breaks the tackle and rushes straight forward another 21 m in 4.2 s.
Part (a) Calculate the running back's average velocity in the horizontal direction during the first interval, in meters per second.
Part (b) Calculate the running back's average velocity in the horizontal direction during the second interval, in meters per second.
Part (c) Calculate the running back's average velocity in the horizontal direction during the third interval, in meters per second.
Part (d) Calculate the running back's average velocity in the horizontal direction for the entire motion, in meters per second.
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