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Provide an Appropriate Response 3.13.1 Feet Above the Ground 150ft/sec150 \mathrm { ft } / \mathrm { sec }

Question 74

Multiple Choice

Provide an appropriate response.
-A baseball is hit when it is 3.13.1 feet above the ground. It leaves the bat with an initial speed of 150ft/sec150 \mathrm { ft } / \mathrm { sec } , making an angle of 2424 ^ { \circ } with the horizontal. Assuming a drag coefficient k=0.12k = 0.12 , find the range and the flight time of the ball. For projectiles with linear drag:
x=x0+v0k(1ekt) cosα,y=y0+v0k(1ekt) sinα+gk2(1ktekt) \begin{array} { l } x = x _ { 0 } + \frac { v _ { 0 } } { k } \left( 1 - e ^ { - k t } \right) \cos \alpha , \\y = y _ { 0 } + \frac { v _ { 0 } } { k } \left( 1 - e ^ { - k t } \right) \sin \alpha + \frac { g } { k ^ { 2 } } \left( 1 - k t - e ^ { - k t } \right) \end{array}
where k\mathrm { k } is the drag coefficient, v0\mathrm { v } _ { 0 } and α\alpha are the projectile's initial speed and launch angle, and gg is the acceleratic of gravity (32ft/sec2) \left( 32 \mathrm { ft } / \mathrm { sec } ^ { 2 } \right) .


A) Flight time = 3.97 sec; range = 424.4 feet
B) Flight time = 3.74 sec; range = 413.5 feet
C) Flight time = 2.82 sec; range = 393.5 feet
D) Flight time = 3.62 sec; range = 402.2 feet

Correct Answer:

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