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What is the work done when a force vec F...

What is the work done when a force `vec F =2hati +3hatj-5hatk` units acts on a body, producing a displacement `vec S =2hati+4hatj+3hatk` units ?

A

zero units

B

30 units

C

1 unit

D

45 units

Text Solution

Verified by Experts

The correct Answer is:
C
`W = vec F cdot vec S =(2hati +3hatj -5hatk ) cdot (2hati +4hatj+3hatk)`
`=4+12-15=1` unit
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