1.

A brick of mass 2 kg begins to slide down on a plane inclined at an angle of 45o with the horizontal.  The force of friction will be                          [CPMT 2000]

A.             \[19.6sin{{45}^{o}}\]
B.               \[19.6\text{ }cos\text{ }{{45}^{o}}\]
C.             \[9.8sin{{45}^{o}}\]
D.               \[9.8\text{ }cos\text{ }{{45}^{o}}\]
Answer» B.               \[19.6\text{ }cos\text{ }{{45}^{o}}\]


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