A box slides down a 38.4

◦

ramp with an

acceleration of 1.33 m/s

2

.

The acceleration of gravity is 9.8 m/s

Determine the coefficient of kinetic friction

between the box and the ramp.

Hope this helps

ma = mg sinθ - μ mg cosθ

Now you can factor out the mass. a = g sinθ - μ g cosθ See...I told you we wouldn't need the mass! We can also simplify the right side a bit... a = g(sinθ - μ cosθ) 1.11 m/s² = (9.81 m/s²)(sin37º - μ cos37º) 1.11 m/s² = (9.81 m/s²)(0.602 - μ(0.799)) 0.113 = (0.602 - μ(0.799)) -0.489 = -μ(0.799) μ = 0.612 I hope that helps. Good luck!

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