A small ball falling vertically downward with constant velocity `4m//s` strikes elastically a massive inclined cart moving with

A small ball falling vertically downward with constant velocity `4m//s` strikes elastically a massive inclined cart moving with velocity `4m//s` horizontally as shown. The velocity of the rebound of the ball is

A. `4sqrt2 m//s`
B. `4 sqrt3 m//s`
C. `4 m//s`
D. `4 sqrt5 m//s`

A small ball falling vertically downward with constant velocity `4m//s` strikes elastically a massive inclined cart moving with velocity `4m//s` horiz

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