siDe 1 ER SHEET A 55.0-kg person, at rest. runining horizontally with a velocity
ID: 1795982 • Letter: S
Question
siDe 1 ER SHEET A 55.0-kg person, at rest. runining horizontally with a velocity of 6.0 m/s, jumps onto a 9.0-kg sled that is initially ng effects of frietion during the collision, find the velocity of the sled and person after the collision A) 1.7m/s B)2.3 m/s C)3.1 ms D)49 m/s E5.2 m/s F)6.3 m/s 21. The sled and person coast 35.8m 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)23.5N D) 24.2N E)25.INF) 26.7 N t is the coefficient of kinetic friction between the sled and the snow? 0.012 B)0.039 C)0.055 D) 0.076 E) 0.128 F) 0.94Explanation / Answer
a)conserving the momentum before and after collision
55.5kg * 6m/s = 64.5kg * v
v = 5.1628 m/s
21.
v² = 0 = u² + 2as = (5.1628m/s)² + 2 * a * 35.8m
a = -0.3723 m/s²
22.
µ = Ff / Fn
= ma / mg
= a / g
= -0.3724/9.8 = 0.03798
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