A block is placed at the bottom of inclined plane and projected upward with some speed. Angle of inclination of plane is 'θ' & coefficient of friction b/w block and surface is ' 
'. If time of ascent & descent t 1 & t 2 respectively then –
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(c, d)
upward motion
∴ a = g (sin θ + µ cos θ )
downward motion
∴ a = g (sin θ – µ cos θ )
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