a truck starts from rest and rolls down a hill with a constant acceleration .it travels a distance of 400m in 20s . find the acceleration . find the force acting on it if its mass is 7 metric tonne (1 metric tonne = 1000kg). 

@h@ii...

the truck starts from rest so u=0 

s=ut+1/2 at'2

s=400,  t =20, we should find acceleration

s=ut+1/2 at''2

400=[0]20+1/2[a]  [20] [20]

400=0+1/2[400] [a] 

400=[200] [a]

400/200=a

  2=a

  f=ma

[1tonne]=1000kg

then 7 tonne=[7]  [1000]

  m =7000

  a=2

  f=ma

 f=[7000] [2]

  =14000 N

hope it helped ya...:) :)

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