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Mechanics help!!

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mousa:
plz , i need your help doing those Questions.



June 2009, Q6 part(iv)
June 2006 ,Q5 part(i)
November 2004 , Q2 part (ii)

Thanks in advance

astarmathsandphysics:
 When I get home

astarmathsandphysics:
6i)s=1/at^2 so a=2s/t^2=2m/s^2
ii)v=u+at=2*9.6=1.2m/s
s=
u=1.2
v=0
a=-9.8
t=
v^2=u^2+2as
0=1.44-19.6s so s=1.44/19.5

astarmathsandphysics:
2nd question

astarmathsandphysics:
Resolve paralell to plane Pcos 30-mgsin30=0
P=mgcot30=18/tan30

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