A block of mass m is pushed off with an initial speed u so that it moves up a rough plane inclined at an angle @ to the horizontal. the friction between the block and the plane is R. Deduce an expression for the velocity v of the block after it has moved a distance d along the inclined plane. Explain any additional symbols in your expression.(adsbygoogle = window.adsbygoogle || []).push({});

which is correct:

(1) 1/2mu^2 - mgd sin @ - Rd = 1/2mv^2

v = [ (mu^2 - 2mgd sin @ - 2Rd) / m]^1/2

(2) 1/2mu^2 - mgd sin @ - Rd = mgd sin @ + 1/2mv^2

v = [ (mu^2 - 4mgd sin @ - 2Rd) / m]^1/2

AND WHY?

thank you.

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