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can u draw components indicate +and -

Have you learned about FBD?

i am always getting T-Mg cos 60 =Ma

what is FBD

Free body diagram.

i know

So the next step is to isolate the object and put all forces that are applied TO the body.

Memorizing formulas is dangerous, because sometimes theta can refer to something else.

|dw:1358006756106:dw|

i did not memorize i drew FBD

something wrong with vectors

|dw:1358006741723:dw|
Do you have something like this?

^ what i have

According your your FBD,
"T-Mg cos 60 =Ma" is not correct.

i mean T-Mg sin 60

=Ma

That's good. Can you continue?

yes i can but i am getting acceleration as -

|dw:1358007157522:dw|

this is other half

-T+mg sin 30 =Ma

M is 5kg for both find the acceleration

|dw:1358007244777:dw|
So you have two unknowns (T and a) and two equations. :)

ok so i got mgsin 30-mgsin 60=ma+ma

m=5kg for both i got a=-1.830 which is wrong

i must get a=1.830

Your equation assumed that the masses accelerate DOWN the 30 deg. plane, so a<0 is correct! :)

so what ur doing is making accelration + right

thanks

yw! :)