Problem 8.11 Part A You are standing on a sheet of ice that covers the football

Question

Problem 8.11 Part A You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction behween your feet and the ice. A friend throws you a 0 430 kg ball that is traveling horizontally at 9.00 m/s. Your mass is If you catch the ball with what speed do you and the bal move afterwards? 68.0 kg 0.056 cm/s Submit Mv Answers Give Up Incorrect; Try Again; 4 attempts remaining Part B If the ball hits you and bounces off your chest, so that afterwards it is movin the collision? g horizontally at 8.20 m/'s in the opposite direction, what is your speed after em/s

Explanation / Answer

here,

mass of ball , m1 = 0.43 kg

mass of person , m2 = 68 kg

intial speed of ball , u1 = 9 m/s

a)

let the final speed be v

using conservation of momentum

m1 * u1 = (m1 + m2) * v

0.43 * 9 = ( 0.43 + 68) * v

v= 0.05655 m/s

v = 5.7 cm/s

the final speed is 5.7 cm/s

b)

final speed of ball , v1 = - 8.2 m/s

let the final speed of person be v2

using conservation of momentum

m1 * u1 = m1 * v1 + m2 * v2

0.43 * ( 9 + 8.2) = 68 * v2

v2 = 0.1088 m/s = 10.9 cm/s

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