at the county fair, chris throws a 0.12 Problem 9.69 Part A At the county fair,

Question

at the county fair, chris throws a 0.12 Problem 9.69 Part A At the county fair, Chris throws a 0.12 kg baseball at a 2.5 kg wooden milk bottle, hoping to knock it off its stand and win a prize. The ball bounces straight back at 25 % of its incoming speed, kn ing the bottle straight forward. What is the bottle's speed, as a percentage of the bair's incoming speed? Express your answer using two significant figures Phosel) Submit My Answers Give Up Incorrect; Try Again; 6 attempts remaining quite. Chock through your caloulations; you may have made a rounding error or used the wrong number of sig

Explanation / Answer

From law of conservation of linear momentum

m1 v1i + m2 v2i = m1 v1f + m2 v2f

m1 v = m1 [-25 / 100 * v] + m2 v2f

m2 v2f = m1 [ v + 25/100 v] = 125/100 m1 v

v2f = [m1 / m2] * v * 125/100

= [0.12 / 2.5] * v * 125/100

= 0.06 v = 6.0 %

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