ch09-p023 - 23. The initial direction of motion is in the...

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where m is the mass, v i the initial velocity, and v f the final velocity of the ball. Thus, () ( ) 3 avg 0.40kg 14m s 1200 N 27 10 s 67m s. 0.40kg i f mv F t v m −× −Δ == = (a) The final speed of the ball is || f v = 67 m/s. (b) The negative sign indicates that the velocity is in the – x direction, which is opposite to the initial direction of travel. (c) From the above, the average magnitude of the force is 3 avg 1.20 10 N F . (d) The direction of the impulse on the ball is –
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