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Crate P of mass 1,25kg is connected to another crate, Q of mass 2kg by a light inextensible string. The two crates are placed on a rough horizontal surface. A constant force F of magnitude 7,5N ,acting at an angle to the horizontal is applied on crate Q . Crate P experience a constant friction force of 1,8N and crate Q experience a constant friction force of 2,2N. determine whether the 2 crates are made of the same material