A force F =6i +2j-3k acts on a particle
and produces a displacement of
s = 2-3j+xk. If the work done is zero, the
value of x is
1.-2 2.1/2 3.6 4.2
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Explanation:
since
work done =0
W = F . s
F = 6i+2j+3k
s = 2i-3j+xk
F . s =0
(6i+2j+3k)(2i-3j+xk)=0
6(2) + 2(-3) + 3x =0
12 - 6 + 3x =0
6 + 3x = 0
x = -2
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