TS EAMCET 2017 Code A Solved Paper

The total force on the particle is calculated as follows,
F=F1+F2
=

∧

i

+2

∧

j

+3

∧

k

+4

∧

i

−5

∧

j

−2

∧

k

=(5

∧

i

−3

∧

j

+

∧

k

)N
The displacement of particle is calculated as,
s=r2−r1
=7

∧

k

−20

∧

i

−15

∧

j

=(−20

∧

i

−15

∧

j

+7

∧

k

)cm
Calculate the amount of work done as follows.
W=F⋅s
=(5

∧

i

−3

∧

j

+

∧

k

)(−20

∧

i

−15

∧

j

+7

∧

k

)×10−2
=(−100+45+7)×10−2
=−0.48J