Part 1 A cross-country skier is skiing along at a zippy 8.0 m/s. She stops pushi

Question

Part 1

A cross-country skier is skiing along at a zippy 8.0 m/s. She stops pushing and simply glides along, slowing to a reduced speed of 6.0 m/s after gliding for 5.0 m.What is the magnitude of her acceleration as she slows?

Part 2

Sanity Check: Answer the question. “Does this answer make sense in light of the rest of the knowledge I possess?” The algebraic solution you arrived at in the “Solve” step is one of the more powerful tools you can use for a sanity check. See the example below of a sanity check used in this manner (Sanity Check 1). The sanity check could also include a back of the envelope calculation done with a single significant digit (Sanity Check 2) or a unit analysis of the final answer (Sanity Check 3). (Note: One Sanity-Check is sufficient.)

Explanation / Answer

Part 1

initial speed = 8 m/s

final speed = 6 m/s

distance travelled = 5 m

let the acceleration magnitude be a

62=82+(2*a*5)

a=-2.8 m/s2

this means the deceleration is 2.8 m/s2

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