BITSAT 2019 Paper

We know Power =‌

‌ Workdone ‌

‌ time ‌

- - - (A)
Also work done = Force × displacement- - - - - (B)
Work done is the dot product of the vector quantities
W⋅D=[2

∧

i

+3

∧

j

+4

∧

k

]⋅[3

∧

i

+4

∧

j

+5

∧

k

]
=6+12+20
=38
Substituting the above found value in A
Power =‌

38

4

=9.5W
t=4 seconds (given)