Question

At any instant of time t, the displacement of any particle is given by 2t – 1 (SI unit) under the influence of force of 5N. The value of instantaneous power is (in SI unit):

Options

• 7

• 6

• 10

• 5

Answer 1

10

Explanation:

Given: Force (F) = 5 N

Displacement (s) = 2t – 1

Instantaneous velocity (v) = `(ds)/dt`

= `d/dt (2 t - 1)`

= 2 ms⁻¹

Instantaneous power (P) = Fv

= 5 × 2

= 10 W