The position of an object mov- ing along an r axis is given by r =...

 

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The position of an object mov- ing along an r axis is given by r = 3t – 4t2 + t³, where r is in meters and t is in seconds. i What is the object displacement between t = 3 s and t = 4 s? ii What is its average velocity for the time interval t= 1 s and t = 3 s? iii Is there ever a time when the velocity is zero ? iv What is the its instantaneous acceleration at t = 2 s? Answer: i) 12 m ii) 0 m/s iii) 0.89 s, 1.77 s iv) 4 m/s² The position of an object mov- ing along an r axis is given by r = 3t – 4t2 + t³, where r is in meters and t is in seconds. i What is the object displacement between t = 3 s and t = 4 s? ii What is its average velocity for the time interval t= 1 s and t = 3 s? iii Is there ever a time when the velocity is zero ? iv What is the its instantaneous acceleration at t = 2 s? Answer: i) 12 m ii) 0 m/s iii) 0.89 s, 1.77 s iv) 4 m/s²