A block of mass $2 kg$ slides down an incline plane of inclination $30^o$. The coefficient of friction between block and plane is $0.5$. The contact force between block and plank is :
A block of mass $2 kg$ slides down an incline plane of inclination $30^o$. The coefficient of friction between block and plane is $0.5$. The contact force between block and plank is :
- A
$5\sqrt 15 Nt$
- B
$10\sqrt 3\,Nt$
- C
$5\sqrt 7 Nt$
- D
$20 \,Nt$
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