Question

A force F=2i+j+4k when acts on a body changes its position vector from (3,2-1) to (9,5,-1). Find the workdone by the force ​

Answer 1

Answer:

work done = 15 J

Explanation:

F = 2i + j + 4 k

S = ( 9-3 )i + (5-2)j +(-1+1)k

W = ( 2i+ j + 4k).(6i+3j)

= 12 + 3

= 15J

Answer 2

Answer:

W = F.s

W = ( 2i + j + 4k ) . ( 6i + 3j )

W = 12 + 3

W = 15 J

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