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A block of mass m is kept on a plank . T...

A block of mass m is kept on a plank . The coefficient of friction between the plank and block is 1. The plank is slowly raised from one end so that it makes angle `theta` with horizontal . The forces of friction acting on the plank , when `theta = 30 ^(@) and theta 60^(@) ` are respectively,

A

a. `(mg/2),(mg/2)`

B

b. `(sqrt(3mg))/2,(mg)/2`

C

c. ` (mg)/2,(sqrt(3mg))/2`

D

d. `mg,mg`

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A
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