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Kinematics conceptual

# The average acceleration direction between points a

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Unformatted text preview: B is twice its speed at point A. The average acceleration direction between points A and B is best described by a) vector a, b) vector b , c) vector c, d) vector d, e) vector e. QUICK QUIZ 4.1 ANSWER (d). Although the actual values of the speed of the car at points A and B are not known, the direction of the average acceleration is uniquely defined by the fact that the speed at point B is double the speed at point A. The relationship between the average acceleration and the difference in the velocity vectors, ā = (vf – vi)/∆ t, determines the direction of the average acceleration vector, as shown. The angle between the acceleration vector and the final velocity vector is uniquely determined by tanθ = ½. QUICK QUIZ 4.5 (end of section 4.6) During a battle in the desert, a tank fires a projectile while going in reverse. The projectile hits an enemy humvee that is traveling away from the tank at the time. The speed of the projectile relative to the humvee is determined by a) adding the speed of the tank to the barrel speed of the projectile to the speed of the humvee, b) adding the speed of the projectile to the speed of the humvee and subtracting the speed of the tank, c) adding the speed of the tank to the speed of the projectile and subtracting the speed of the humvee, or d) subtracting the speed of the tank and the speed o...
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