A 55.0-kg/person, at rest. running horizontally with a y with a velocity or 50 m

Question

A 55.0-kg/person, at rest. running horizontally with a y with a velocity or 50 mjn odle 9 S ld ther s bibsly 20. Ignoring the effects of friction during the collision, find the velocity of the sled and person after the collision. A) 1.7 m/s B)23 m/s C)3.1 m/s D)49 m's E) 5.2m's F)63m's 21. The sled and person coast 35.8 m on level snow before coming to rest. Use the work-energy theorem to find the force of kinetic friction between the sled and the snow A) 21.6N B)224N C)23.5 N D) 242 N E)25.IN )26.7N ent of kinetic friction between the sled and the snow? kinetic 22. What is the coefficient A) 0.012 2 B)0.039 C)0.05S D0076 E)0.128 F)0.94

Explanation / Answer

Q20

Energy is kept so:

Ekperson = 1/2*mperson*Vperson^2

Ek = 1/2*55*6^2

Ekperson = 990 J

if elastic:

Ekperson = eksled

990 = Eksled

Eksle = 1/2*msled*Vsled^2

990 = 1/2*9*Vsled^2

Vsled = (990*2/9)^0.5

Vsled = 14.832 m/s

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