4CHAPTER OUTLINE4.1 The Position, Velocity, andAcceleration Vectors4.2Two-Dimensional Motionwith Constant Acceleration4.3Projectile Motion4.4Uniform Circular Motion4.5Tangential and RadialAcceleration4.6Relative Velocity andRelative AccelerationMotion in Two DimensionsANSWERS TO QUESTIONSQ4.1Yes. An object moving in uniform circular motion moves at aconstant speed, but changes its direction of motion. An objectcannot accelerate if its velocity is constant.Q4.2No, you cannot determine the instantaneous velocity. Yes, youcan determine the average velocity. The points could be widelyseparated. In this case, you can only determine the averagevelocity, which isvx=∆∆t.Q4.3(a)aaaavvvv(b)aavvavavavQ4.4(a)10 m s±i(b)−980. ms2±jQ4.5The easiest way to approach this problem is to determine acceleration first, velocity second and
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