Question

= A soccer ball player bounces the ball off her head, changing the velocity of the ball. She changes the x-component of the velocity of the ball from Vix = 9.5 m/s to v 3.6 m/s and the y-component from v = -2.1 m/s to v Viy fx Vfy = 3.5 m/s. If the ball has a mass of 0.41 kg and is in contact with the player's head for 7.1 ms, determine the following. (a) direction of the impulse (in degrees counterclockwise from the +x-axis) delivered to the ball º counterclockwise from the +x-axis (b) magnitude of the impulse (in kg · m/s) delivered to the ball kg · m/s

Answer 1

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Vix = 9.5 m/sec , & fix = 3.6 m/sec, Viy -2.1 m/sec If yn 3.5 m/sec, At=7.1 msee m = 0.41 19 a) Impulse = change in momentum =ml& -V) 0-4 (3.313.7)-(5 sỉ - 2- 3) J = – 2.419 Î +2.29 6 Direction, tand= 2.296 - 2.419 = 136.494° with TX-axis in cow b) 17] - J(2.419)+(2-296) = 3.3351 kg-m Sec And