A 100 kg block is kept in the back of a ...

A 100 kg block is kept in the back of a truck moving with an acceleration of `2ms^(-2)` There is no relative motion. What is the work done by frictional force on the block as truck is displaced by 2 m w.r.t. Ground

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Frictional force `f=ma`
`w_(1)=fdcostheta" "d=2m`
`f=ma=100xx2=200N`
`W_(1)fd cos theta=200xx2xx(-1)=-400J`

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