F, (N) 2 t (s) 4 5 -2 Figure P6.17 4)

a 10 m long gliderwith a mass of 680kg is gliding horizotallythrough the air at 30 m/s when a 60 kg skydiver drops outby releasing his grip on the glider what is the glider's velocity just after the skydiver lets go?

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The conservation of momentum tellsus that the momentum of a system ofinteracting particles must remain constant ifthere are no outside forces. However, whentwo cars collide head-on, they can almostinstantly come to rest (and crumpleunfortunately). This system is essentiallyisolated since the only important interactionsare between the two cars. How can youreconcile these two observations?