Two football players are pushing a 60 kg blocking sled across the field at a constant speed of 1.5 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

Maia Beard

Physics

26 December, 04:29

Two football players are pushing a 60 kg blocking sled across the field at a constant speed of 1.5 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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Kathy Ho · Answer 1

F (friction) = u F (normal)

so, F (friction) = (.30) (60*9.81) = 177 N

F = ma

so, 177 = (60) a, a = 177/60 = 2.9m/s^2

v (final) ^2 = v (initial) ^2+2ax

so, 0 = 1.5^2 + 2 (-2.9) x, x = 2.25 / (2*-2.9) = -.38793 the negative indicates that the direction of accel is opposite of direction of speed.

-0.39 meters is the answer.