Question 20 Answer and Explanation _ACT June 2011 Asia Form 67B Math Section

Question 20 Answer and Explanation _ACT June 2011 Asia Form 67B Math Section

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20. When a ball is dropped from a height of h feet, the average speed of the ball from the time it is dropped until it hits the ground is $\frac{h}{\frac{\sqrt{h}}{4}}$ feet per second. When the ball is dropped from a height of 400 feet, what is its average speed, in feet per second, from drop to hitting the ground?

F. 5

G. 10

H. 40

J. 80

K. 160

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

400÷(400^0.5÷4)=80. Choose J.