- #1

scytherz

- 11

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## Homework Statement

Two blocks, A and B (mA=50 kg and mB=100 kg), are connected by a string as

shown. If the blocks begin at rest, what will their speeds be after A has slid

a distance d = 0.25 m? Assume the pulley and incline are frictionless.

## Homework Equations

K= .5mv^2

P=mgh

ke(initial) + pe(initial) = kef = pef

## The Attempt at a Solution

.5mvi^2 + mghi = .5mvf^2 + mghf (at rest)

.5mvf^2 = -mghf

.5(50 kg) vf^2 = -100(-9.8)(.25sin37)

vf = 2.42 m/s which is wrong... where did i go wrong? the ans. is 1.51 m/s