1.

If `vec(F) = (5hat(i)+2hat(j) - 4hat(k))N`, the magnitude of force isA. 45 NB. `3 sqrt(5) N`C. 10 ND. 20 N

Answer» Correct Answer - B
Constant velocity means net acceleration is equal to zero. Therefore net pulling/pushing force is zero.
`therefore " "3mg sin 45^(@)-mg sin 45^(@)=mu(3 mg)cos45^(@)`
`therefore " "mu=(2)/(3)`


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