Four particles A, B, C and D with masses...

Four particles A, B, C and D with masses `m_A = m, m_B = 2m, m_c = 3m` and `m_D = 4m` are at the comers of a square. They have accelerations of equal magnitude with directions as shown. The acceleration of the centre of mass of the particles

`frac(a)(5) (hati - hatj)`

`a (hati + hatj)`

zero

`frac(a)(5) (hati + hatj)`

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