Problem 9.22 Part A A 70.0 kg footbal player is gliding across smooth ice at 2.1

Question

Problem 9.22 Part A A 70.0 kg footbal player is gliding across smooth ice at 2.10 m/s He throws a 0.470 football straight forward What is the player's speed afterward if the ballis thrown at 16.0 m/s relative to the ground? Express your answer with the appropriate units. Value Units Submit My Answers Give Up Part B What is the players speed afterward if the ball is thrown at 16 0 m/s relative to the player? Express your answer with the appropriate units. | Value Units Submit My Answers Give Up Continue

Explanation / Answer

Here ,

initial velocity , u = 2.1 m/s

m1 = 70 Kg

m2 = 0.470 Kg

a) let the player's speed is v2

v1 = 16 m/s

Using conservation of momentum

70 * 2.1 + 0.470 * 2.1 = 16 * 0.470 + 70 * v2

v2 = 2.01 m/s

the player's speed is 2.01 m/s

b) when the ball is thrown relative to player

let the player's speed is v

v1 = 16 m/s

Using conservation of momentum

70 * 2.1 + 0.470 * 2.1 = (16 + v) * 0.470 + 70 * v

solving for v

v = 1.99 m/s

the speed of the player is 1.99 m/s

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