Question

Consider the three cases shown in the figure, particle strikes in the vertical plane the
perfectly elastic surfaces such that velocity of particle just striking is perpendicular to
surface in three cases. In first case time taken by particle to strike the surface is 2s, in
second case time is 4s. Then the time taken by particle to strike the surface in 3r case is :​

Answer 1

vertical plane time taken 2s is the answer