Question

A force f = 3i + 3j + 3k N acts on a body produced a displacement 2i + 3j – 3km. The work done
is
WW
A) 15 J
B) 6 J
c) 20 J
D) 12 j​

Answer 1

See in the attachment.

Answer 2

$\huge{\boxed{\bold{Answer}}}$

$\sf \: f.s \\ \\ \implies \tt \: (3i + 3j + 3k)(2i + 3j - 3k)5 \\ \\ \\ \implies \tt \: 6 + 9 - 9j \\ \\ \\ \tt \implies \: 6j \boxed {answer} \\ \\ \huge{ \boxed{ \huge{related \: \: answer}}}$

p=w/t=F•5

W=F•5=(2i+3j+2k)•(3i+4j+5k)

=2×3+3×4+2×5

=285

p=w/t=285/45=7w