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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 Winter '14
 Acceleration, Velocity

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