Question

Force acting on a particle moving in a straight line varies with the velocity of the particle as F = . Here K is constant. The work done by this force in time t is –

• A. . T
• B. 2Kt
• C. Kt
• D. $\frac { 2 \mathrm { Kt } } { \mathrm { v } ^ { 2 } }$

Answer 1

Answer: (C)

Kt

Answer 2

Q F =

\ m = Ž vdv = dt

Ž

Ž = t

Ž $\frac { 1 } { 2 }$ mv² = Kt Ž W = Kt