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Under a force (10hati-3hatj+6hatk) newto...

Under a force `(10hati-3hatj+6hatk)` newton a body of mass 5 kg moves from position `(6hati+5hatj-3hatk)` m to position `(10hati-2hatj+7hatk)`m. deduce the work done.

A

0

B

61 J

C

121 J

D

100 J

Text Solution

Verified by Experts

The correct Answer is:
C
`d vec s =(10 hati-2hatj+7hatk)-(6hati+5hatj-3hatk)`
`=4hati-7hatj +10 hatk`
`therefore" Work done "=vec F cdot d vec s`
`=(10 hati-3hatj+6hatk) cdot (4hati-7hatj+10 hatk)`
`=40+21 +60-121 J`
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