Question

A force vectorF =(3i+4j)N displaces a particles by vector S =(3i+4j)m in 3 second then the power is...??​

Answer 1

Given that,

Force

F

=5

i

^

+4

j

^

Displacement

s

=3

i

^

+4

k

^

Time t=3s

Now, the work done is

W=

F

⋅

s

W=(5

i

^

+4

j

^

+0

k

^

)⋅(3

i

^

+0

j

^

+4

k

^

)

W=15+0+0

W=15J

Now, the power is

P=

t

W

P=

3

15

P=5watt

Hence, the power is 5 watt