find the work done by a force F=(i^+2j^-5k^)N to displace a body through a displacement S =(2i^+2j^+2k^)m
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W=F.S
W=(i^+2j-5k^)(2i^+2j^+2k^)
w=2+4-10. (i^.i^=1, j^j^=1, k^k^=1)
W= -4J
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