Two football players are pushing a 60 kg blocking sled across the field at a constant speed of 2.0 m/s. The coefficient of kinetic friction between the grass and the sled is 0.30. Once they stop pushing, how far will the sled slide before coming to rest?

Question

Kipper

Physics

29 May, 22:13

Two football players are pushing a 60 kg blocking sled across the field at a constant speed of 2.0 m/s. The coefficient of kinetic friction between the grass and the sled is 0.30. Once they stop pushing, how far will the sled slide before coming to rest?

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Answers (1)

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Karen Lucero · Answer 1

The sled slides d=0.155 meters before rest.

Explanation:

m = 60 kg

V = 2 m/s

μ = 0.3

g = 9.8 m/s²

W = m * g

W = 588 N

Fr = μ * W

Fr = 176.4 N

∑F = m * a

a = (W+Fr) / m

a = 12.74m/s²

t = V/a

t = 0.156 s

d = V*t - a*t²/2

d = 0.155 m