A crate of mass $50kg$ is pushed a distance of $6.0 m$ along a horizontal surface against a constant resistive force of $70N$. The crate moves at a constant speed. It is then lifted, at a constant speed, through a vertical distance of $1.2 m$ onto the back of a lorry.
What is the total work done in this process?
1 )
$420 J$
2 )
$480 J$
3 )
$590 J$
$1000 J$
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