The expression v = (delta)x/(delta)t can be used to determine the velocity: a. a

Question

The expression v = (delta)x/(delta)t can be used to determine the velocity:

a.   at any time.

b.   only when velocity is constant.

c.    only when acceleration is constant.

d.     at no time.

Provide all logical steps in the solution(s)/answer(s).

The position of a body is given by:v(t)= -3.2t + 0.18t^2 where v is in m/s and t in s.

(a) What are the units of the number -3.2? Explain how you know.

(b) Calculate the average acceleration of the body during the first 0.12 min of its motion.

(c)   On the plot of t vs. x below, draw the line that you would use to determine the average velocity on the interval defined in (b) by graphical means.

Explanation / Answer

c.    only when acceleration is constant.

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