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If vec(F) = (5hat(i)+2hat(j) - 4hat(k))N...

If `vec(F) = (5hat(i)+2hat(j) - 4hat(k))N`, the magnitude of force is

A

45 N

B

`3 sqrt(5) N`

C

10 N

D

20 N

Text Solution

Verified by Experts

The correct Answer is:
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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