A 1 kg block is a given a velocity of 15 m//s towards right over a very long rough plank of mass 2kg placed on a smooth horizontal surface as shown in figure.
If coeficient of friction between the two blocks is equal toi 0.4 then magnitude of initial slope (in S.I unit)`P_(1)` versus t and `P_(2)` versus t (in SI unit) will be:
A. 4 and 2
B. 2 and 4
C. 4 and 4
D. 2 and 2
