Question

A partide moves from point P(1,2,3) to Q(2, 1,4) under the action of a constant force F - (2i+j+k) N then the Workdone by the force is(1) 2j(2) 4J(3) 16 J (4) 8j​

Answer 1

Explanation:

As the force is constant so the work done will be equal to F•S

Displacement : ( 2-1) i + ( 1-2) j + ( 4-3 ) k

Displacement : 1i - 1j + 1 k

Force : + 2i +1j + 1k

Work Done = F•S ( Dot product )

Work Done = 2 - 1 + 1

WorkDone = 2 J