A particle is projected along the line of greatest slope up a rough plane inclined at an angle of `45^(@)` with the horizontal. If the coefficient of friction is `1//2` . Their retardation is:

A particle is projected along the line of greatest slope up a rough inclined plane at an angle of 45^(@) with the horizontal. If the coefficient of friction is (1)/(2) then the retardation is :

. A particle is projected up along a rough inclined plane of inclination 45^(@) with the horizontal. If the coefficient of friction is 0.5, the acceleration is

A body is projected up along a rough inclined plane of inclination 45 ^@ . The coefficient of friction is 0.5. Then the retardation of the block is

A block is projected up along the line of greatest slope of an inclined plane of angle of inclination 0(ltphi) where phi= angle of friction. Which of the following friction time graph is CORRECT ?