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

Physics

Hope Hooper

13 February, 14:38

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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Hale · 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.