A truck starts from rest and rolls down a hill with a constant acceleration .It travels a distance of 400 m in 20 ms.Find its acceleration 6 tones (Hint:1 tonne =1000 kg)

Explanation

Here,u=0,s =400 m,t=20 s,a =?F=?
`s=ut+(1)/(2)st^(2)`
`therefore 400=0xx20+(1)/(2)axx(20)^(3)`
`therefore 400=(1)/(2)xxaxx400`
`therefore a =(400xx2)/(400)`
`therefore a=2 ms^(-2)`
m=7 tonnes =`7xx1000`kg=7000 kg
`a=2ms^(-2)`
F=,a=7000xx2=14000N`