Comprehension # 6
A `1 kg` block is given a velocity of `15 m//s` towards right over a very long rough plank of mass `2 kg` as shown in figure.

If coeficient of friction between the two blocks is equal to `0.4`, then magnitude of linitial slope of `p_(1)` versus t and `p_(2)` versus t (in SI unit) will be :-

Options

A. 4 and 2
B. 2 and 4
C. 4 and 4
D. 2 and 2

Answer

C

Explanation

`(dp)/(dt) = f_(ext)`
For blocks of `1 kg`
friction `f_(r) = mumg = 0.4 xx 1 xx 10 4 N`