A car traveling in astraight-linepath has a velocity of +10.0 m/s at some instan

Question

A car traveling in astraight-linepath has a velocity of +10.0 m/s at some instant. After 3.60 s,its velocity is +6.65m/s. What is the average acceleration of the car during this timeinterval?

A) +0.615 m/s

B) -0.931 m/s

C) +0.931 m/s

D) -0.615 m/s

7) Inone-dimensional motion,the average speed of an object that moves from one place to anotherand then back to its original place has which of the followingproperties?

A) It is negative. B) Itcan be positive, negative, or zero.

C) It is positive. D) It iszero.

Explanation / Answer

the average acceleration of the car during this timeinterval a=(6.65-10)/3.6= -0.931m/s2 (b) the averagespeed of an object is always posistive. => answerC (b) the averagespeed of an object is always posistive. => answerC

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