. A train travels due south at 60 m\'s It reverses its What is the change in vel

Question

. A train travels due south at 60 m's It reverses its What is the change in velocity of the train? (ab) (bd) 60 m's-due north (ee) 40 m's due south you have marked your Scanton with cil, NO Ink! direction & travels due th at 40 (he) zetos 2. What are the dimensions of acceleration? Use L for length& T for time (ab) IL] IT (ce) LP [T]2 IT be L IT) 3. Which one of the following choices is a vector quantity? (de) mass (ab) temperature (bd) displacement (ce) volume (be) time 4. An object moving along a straight line is decelerating. Which one of the following statem concerning the object's acceleration is necessarily true? (bd) The value of the acceleration is positive. (ad) The direction of the acceleration is in the direction opposite to that of the velocity. (bc) The direction of the acceleration is in the same direction as the displacement (ce) An object that is decelerating has a negative acceleration. (ae) The acceleration changes as the object moves along the line. 5. B, then what is the angle between A & B? If A (bd) 0 (ab) 90 (ce) 180 (be) 270 (ac) 360 track of radius, r = 240 m, wha (bd) 2tr (ab) zero 6. A car has traveled completely around a circular its displacement? (de) r (ae) (be) 2r

Explanation / Answer

1) consider south as the negative Y-axis and north as the +Y-axis

then

initial vlocity is Vi = -60 m/s

final velocity is Vf = 40 m/s

chnage in velocity is dV = Vf-(Vi) = 40-(-60) = 40+60 =100 m/s due north

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