Why do we not take into account the normal forces or the frictional forces actin

Question

Why do we not take into account the normal forces or the frictional forces acting on the jumper when determining the vertical components of the impulse? The triple jump is a track-and-field event in which an athlete gets a running start and tries to leap as far as he can with a hop, step, and jump. Shown in the figure is the initial hop of the athlete. Assuming that he approaches the takeoff line from the left with a horizontal velocity of 10 m/s, remains in contact with the ground for 0.18 s, and takes off at a 50

Explanation / Answer

mv1+?Imp1?2=mv2

you would end up with 51.1W. The book's answer was 6.21W.

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