Question

A particle gets displaced through î + 2 - 4k due to
a force 2 î - 39 - 6. The displacement and force are
measured in M.K.S. units. Find the work done.​

Answer 1

Answer:

Step 1: Finding Displacement vector for calculating Work done

Δr

=

r

2

−

r

1

=(3

i

^

+2

j

^

−2

k

^

)−(2

i

^

−

j

^

+

k

^

)

∴

Δr

=(

i

^

+3

j

^

−3

k

^

)

Step 2: Calculation of workdone

Work done W=

F

.

Δr

⇒ W=(2i+j−k). (i+3j−3k)

⇒ W=2+3+3=8J

∴ Work Done by the force is 8J