Question Number 6443 by sanusihammed last updated on 27/Jun/16
$${Calculate}\:{the}\:{workdone}\:{by}\:{a}\:{force}\:{of}\:\:\mathrm{30}{kg}\:{whose}\:{line}\:{of}\:{action} \\ $$$${has}\:{direction}\:{cosines}\:\:\frac{\mathrm{2}}{\mathrm{5}},\:\frac{\mathrm{1}}{\mathrm{5}},\:{and}\:\:\frac{\mathrm{3}}{\mathrm{5}}\:{on}\:{a}\:{displacement}\:{from}\:\:\: \\ $$$${the}\:{point}\:\left(\mathrm{1},\mathrm{2},\mathrm{5}\right)\:{to}\:{the}\:{point}\:\left(\mathrm{7},\mathrm{5},\mathrm{2}\right) \\ $$$$ \\ $$