Dont pull the cart.........

Five persons A, B, C, D and E are pulling a cart of mass 100kg on a smooth surface and cart is moving with a acc. of 3m/s^2 in east direction. When person 'A' stops pulling, it moves with acc. 1m/s^2 in the west direction. When person 'B' stops pulling,it moves with acc. 24m/s^2 in the north direction. The magnitude of acc. of the cart when only A and B pull the cart keeping their directions same as the old direction is

(2)3(71)^1/2 m/s^2

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