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2 Secure https//www.mathxl.com/Student/PlayerHomework.aspxhomeworkld 4614766578iquestionld- 18flushed falsecld-48023098icenterwin-ye 2018 Spring Math 1324-29 Online Homework: 3.2 Score: 0 of 1 pt X Phys Sci 3.2.63 LaQuisha McKinley& 1/29/18 12:07 AM Sav 9 of 10 (9 complete) HW Score: 80%, 8 of 10 E Question Help f a ball is thrown upward at 64 feet per second from a height of 4 feet, the height of the ball can be modeled by S-4+64t-162 feet, where t is the number of secon after the ball is thrown. How long after the ball is thrown is the height 64 feet? It takes seconds for the ball to reach the height 64 feet Type an integer or a simplified fraction. Use a comma to separate answers as needed) Enter your answer in the answer box and then click Check Answer All parts showing ciear Al

Explanation / Answer

Given :

S=4+64t-16t2

S(0)=4

Since the height is calcluated from ground ,

S=64

64 = 4+64t-16t2

=> 16t2-64t+60=0

=> 4(4t2-16t+15)=0

=> 4(4t2-6t-10t+15)=0

=> 4(2t-3)(2t-5)=0

=> t=5/2 sec(while coming downwards) and t= 3/2 sec(while going upwards)

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