At what two times is the object at rest? (b) At what times is the object not acc

Question

At what two times is the object at rest? (b) At what times is the object not accelerating? (c) What is the acceleration at t = 4? (d) What is the acceleration at t = 16 (e) At what times is the acceleration defined and changing? (f) At what times is the acceleration defined and changing? (g) What is the instantaneous speed t = 10 s? (i) How far does the object travel for t = 0 to t = 14? (k) For what values of time is the object's instantaneous speed increasing? (l) At what time is the object furthest left(left is the negative direction)? (M) What is the average acceleration of the object between t = 2s and t = 6 sec.

Explanation / Answer

(a) 5 s and 17 s , object is at rest.

(b) from 7s to 15 s , object is not accelerating as slope of graph is zero.

(c) acceleration= -28/7 = -4 m/s^2.

(d) acceleration=8/2 = 4 m/s^2.

(e) 18 and 19 seconds , since slope is changing.

(f) from 17 to 20 seconds, since slope is changing.

(g) 8 m/s , from the graph value.

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