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All Mechanics DOUBTS HERE!!!

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a.k.:
i was hopeing someone could help me with this question i have to do for homework, which is from a text book, so i do have the answer, but it is difficult.
Question - Particle A of mass 1kg is at rest 0.2m from the edge of a smooth horizontal 0.8m high table. It is connected by a light inextensible string of length 0.7m to a partcle B of mass 0.5kg. Partcle B is intially at rest at the edge of the table closest to A but then falls off. Assuming B's initial horizontal velocity to be zero find the speed with which A begins to move?

thank you

astarmathsandphysics:
ak see attachment

fawazomar:
Hey! I have no idea how the Example 5 Chapter 2 in the M2 Textbook work.
"A light rectangular plate ABCD has AB=20cm and AD=50cm. Particles of mass 2kg, 3kg, 5kg and 5kg are attached to the plate at the points A,B,C,D respectively. Find the distance of the centre of mass of the loaded plane from:
a. AD
b. AB"
Can anyone explain to me how they find the distance??? I know how to find the centre of mass but it stops there.

aaakhtar19:
assalam.u.alaikum
can any0ne help me solving this questi0n
CIE Board :
paper 04 mechanics
0ctober n0vember 2003
q6

astarmathsandphysics:
here

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