A young ice skater with mass 40.0 kgkg has fallen and is sliding on the frictionless ice of a skating rink with a speed of 21.0 m/sm/s. What is the magnitude of her linear momentum when she has this speed? Express your answer with the appropriate units.   What is her kinetic energy? Express your answer with the appropriate units.   What constant net horizontal force must be applied to the skater to bring her to rest in 5.00 ss? Express your answer with the appropriate units.

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