FrictionMedium
Question
A body is projected up along the rough inclined plane from the bottom with some velocity. It travels up the incline and then returns back. If the time of ascent is ta and time of descent is td, then
Options
A.ta = td
B.ta > td
C.ta < td
D.data insufficient
Solution
Let velocity of projection be V and velocity of the block when it returns back = V′
then V > V′ (since some K.E. is lost to friction)
Hence average velocity during ascent > average velocity during descent
⇒ ta < td
then V > V′ (since some K.E. is lost to friction)
Hence average velocity during ascent > average velocity during descent
⇒ ta < td
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