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a150daysflood
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Homework Statement
In this problem, take g = 10 m s-2.
A uniform plank of length 14 m long and mass 20 kg is being supported at B and C as shown above.
Two boys X and Y of masses 20 kg and 50 kg respectively are right on top of the supports.
X starts to walk towards A and Y walks towards D at the same time.
If both boys walk at 1.0 m s-1, the plank begins to overturn after how many seconds?
Homework Equations
Clockwise moment = anticlockwise moment
fs=fs
The Attempt at a Solution
The answer given is 4seconds.
i can't work it out,really need help.
Need a little hint please.
Thanks.
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