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

Wells

7 June, 23:17

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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Lilly Christian · 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.