DQuestion 3 1 pts Consider motion in one dimension. (The sign of the vector quan

Question

DQuestion 3 1 pts Consider motion in one dimension. (The sign of the vector quantities is their direction indicator.) An object moves in the positive x-direction with speed 6.6 m/s for 4.6 s. It stops for 2.5 s and then moves in the negative x direction with speed 1.6 m/s for 2.7 s. What is the average velocity of this object in units of m/s? Enter a number with two digits behind the decimal point. D Question 4 1 pts A vector of magnitude 20 is added to a vector of magnitude 25. The magnitude of

Explanation / Answer

during in the time interval t1 = 4.6s

velocity v1x = 6.6 m/s

displacement x1 = v1x*t1 = 6.6*4.6 = 30.36 m

........................

during in the time interval t2 = 2.5s

velocity v2x = 0 m/s

displacement x2 = v2x*t2 = 0 m

..................................

during in the time interval t3 = 2.7 s

velocity v3x = -1.6 m/s

displacement x3 = v3x*t3 = -1.6*2.7 = 4.32 m

average velocity = total displacement / total time

average velocity = (x1+x2+x3)/(t1+t2+t3)

average velocity = (30.36 + 0 + 4.32)/(4.6 + 2.5 + 2.7)

verage velocity = 3.54 m/s <<<<<-----------ANSWER

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