Part a. 6.6 .theexpertta 7/2018 5:00.00 PM End Date: 7/172018 5:00:00 PM Due Dat
ID: 1865642 • Letter: P
Question
Part a. 6.6 .theexpertta 7/2018 5:00.00 PM End Date: 7/172018 5:00:00 PM Due Date: 7 Homework 05 Begin Date: 7/1o2018 5:0000 PM lem Il: Suppose that a 115 kg foothall player running at 6.5 mls catches a 0.49 kg ball moving at a speed of 25 mis with his feet off the ground, whille both of them are moving horizontally er so d if the ball and player are initially moving in the same d ect V 25% Part (a) Calculate the final peed of the player in mete 25% Part (b) Calculate the change in kinetic energy of the system, in joules, after the player catches de ball. AKE Grade Summary Deductions ·5% Potential 95% sino 0 tanO789 Submissions Atempts remaining: 2 cotano asin0 acosO atan0 acotan) sinho 1% per attempt) 1 2 3 O Degrees O Radians vo 1? SubmitHin Hints:-deducts per hint. Hmtsremaning: 1. Feedback,"%" dedacton per feedback. 25% Part (c) Calculate the final speed of the player, in meters per second, ifthe ball and player are initially moving in opposite directions 25% Part (d) Calculate the change in kinetic energy of the system, in joules, in this case.Explanation / Answer
B) delta k = kf - ki = 0.5 (m1 + m2) v^2 - [0.5 m1v1^2 + 0.5 m2v2^2]
= [0.5 (115.49) 6.6^2] - [0.5 x 115 x 6.5^2 + 0.5 x 0.49 x 25^2]
= - 67.128 J
D) delta K = (0.5 x 115.49 x 6.4^2) - (0.5 x 115 x 6.5^2 + 0.5 x 0.49 x 25^2)
= - 217.26 J
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