A particle is undergoing kinematic motion and the displacement as a function of time is given by r(t) = 42 + 10t² -2t³ where r is in meters and t is in seconds. a. Find the average velocity of the particle between t = 1 and t = 4s b. At what time is the instantaneous velocity zero. c. Find the average acceleration between t = 1 s and t = 4 s. d. At what time is the instantaneous acceleration zero.
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.
![**Kinematic Motion of a Particle**
A particle is undergoing kinematic motion, and its displacement as a function of time is given by:
\[r(t) = 42 + 10t^2 - 2t^3\]
where \( r \) is in meters and \( t \) is in seconds.
1. **Find the average velocity of the particle between \( t = 1 \) s and \( t = 4 \) s.**
2. **Determine when the instantaneous velocity is zero.**
3. **Find the average acceleration between \( t = 1 \) s and \( t = 4 \) s.**
4. **Determine when the instantaneous acceleration is zero.**](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2432691a-c29a-4a02-b85a-93b716867369%2F2e83caf7-6ef4-45c7-833a-716c486b67da%2F6qybd1ca_processed.png&w=3840&q=75)
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