A truck of mass 2xx10^3kg travelling at ...

A truck of mass `2xx10^3kg` travelling at `4m//s` is brought to rest in `2s` when it strikes a wall. What force (assume constant) is exerted by the wall?

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Using impulse = change in linear momentum
We have `F.t = mv_(f) = mv_(i) = m(v_(f) - v_(i))`

or `F(2) = 2xx10^(3) [(0 - (-4)] `
` or F = 4 xx10^(3) N `

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