Question Number 114223 by mathdave last updated on 17/Sep/20

Answered by mr W last updated on 18/Sep/20

a=g(sin θ−μ cos θ)  v_2 ^2 −v_1 ^2 =2as  v_2 ^2 −v_1 ^2 =2g(sin θ−μ cos θ)s  ⇒μ=tan θ−((v_2 ^2 −v_1 ^2 )/(2gs cos θ))  ⇒μ=tan 30°−((30^2 −10^2 )/(2×10×100×cos 30°))=0.115

Commented bymathdave last updated on 18/Sep/20

thank ,great work

Commented byTawa11 last updated on 06/Sep/21

great sir