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A toy cart has mass of 4 kg and is kept ...

A toy cart has mass of 4 kg and is kept on a smooth horizontal surface. Four blocks A, B, C and D of masses 2 kg, 2 kg, 1 kg and 1 kg respectively have been placed on the cart. A horizontal force of F = 40 N is applied to the block A (see figure). Find the contact force between block D and the front vertical wall of the cart.

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The correct Answer is:
16N
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