A block sliding across a frictionless table encounters a region of rough surface
with a coefficient of friction of μ. What was the initial speed of the block if it
traveled a distance d before a complete stop?

Question

A block sliding across a frictionless table encounters a region of rough surface
with a coefficient of friction of μ. What was the initial speed of the block if it
traveled a distance d before a complete stop?

irishboy123 · Answer

what d'ya reckon?

what stops the thing sliding?  where does the energy go?

same questions really :p

anonymous · Answer

yes i know but I still dont know how to solve for the intial velocity.Our teacher does not teach

irishboy123 · Answer

KE as it hits friction = $\frac{1}{2}mv^2$
KE when it stops = $0$

Work done by friction: $W = F \times d$, and $F = \mu R = ???$ 

y?