A loaded railroad car is rolling at a constant velocity

[Alexanddros81]

Homework Statement

A loaded railroad car is rolling at a constant velocity when it couples with a spring and dashpot
bumber system. After the coupling, the motion of the car is defined by the relation
$x = 60e^{-4.8t} sin16t$, where x and t are expressed in millimeters and seconds, respectively.
Determine the position, the velocity, and the acceleration of the railroad car when
(a) t = 0, (b) t = 0.3 s.

Homework Equations

The Attempt at a Solution

I get the correct results.
Is my approach to solution correct?

 

[kuruman]

The approach is correct.

 

[youssef1]

name of the book & the page please .....

 

[haruspex]

name of the book & the page please .....

If you tap on the name of the thread creator you will see that Alexanddros has not visited PF for over a year.
Try Googling "A loaded railroad car is rolling at a constant velocity when it couples with a spring and "

 

[erobz]

I believe the images have the text book name, Vector Mechanics Dynamics; Author: Beer; Problem 11.4