HW3 Begin Date: 9/20/2018 12:00:00 AM -- Due Date: 9/29/2018 11:59:00 PM End Dat
ID: 1882900 • Letter: H
Question
HW3 Begin Date: 9/20/2018 12:00:00 AM -- Due Date: 9/29/2018 11:59:00 PM End Date: 12/11/2018 11:59:00 PM (8%) Problem 5: A football player punts the ball from the ground at a 45.0 angle above the horizontal. Without an effect from the wind, the ball would travel 64 m before falling back to the ground. 50% Part (a) What is the initial speed of the ball in ms? vo 25.01 /Correct! 50% Part (b) When the ball is near its maximum height it experiences a brief gust of wind that reduces its horizontal velocity by 1.4 ms. What total distance, in meters, travels the ball horizontally before returning to the ground? Grade Summa Deductions Potential 0% 100% cos0 7 8 9 tanO ( acosO Submissions Attempts remaining (1% per attempt) detailed view Sin cotanasin0 acotanOsinh atan cosh0 anh cotanhO Degrees Radians END Submit Hint Hints: 000 deduction per hint. Hints remaining: 3 Feedback: 0% deduction per feedback.Explanation / Answer
Time of flight , t = 2vsin(theta) / g
t = 2*25.01*sin45 / 9.8
t = 3.609 sec
Therefore, distance covered after max height is given as
x = v*cos (theta) - 1.4 * (t /2)
x = (25.01*cos 45 - 1.4) * 3.609 / 2
x = 29.38 m
Therfore, new range
R = 32 + 29.38
R = 61.38 m
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