Question

Question no 4th & 5 th plze plze plze

Answer 1

Force acting along the inclination is = mgsinΘ  - μmgcosΘ


so acceleration a =(mgsinΘ  - μmgcosΘ)/m


                         =gsinΘ  - μgcosΘ


S =ut +1/2 a t2  


8=0+1/2 (gsinΘ  - μgcosΘ)*4


or 4=10*1/2  - μ*10*√3/2


  μ=1/5√3