Question

Given

R = 68 m

theta = 21.4

speed v = 26.4 m/s

from the relation

tan(theta) = (v^2 -( mue * R * g)) / (mue *v^2 + (R * g))

tan(21.4) = (26.4^2 -(mue * 68 * 9.8)) / ( mue * 26.4^2 + (68 * 9.8))

mue = 0.46

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