Velocity-time graph of a particle moving in a straight line is as shown in figure. Mass of the particle is 2 kg. Work done by all the forces acting on the particle in time interval between t = 0 to t = 10 s is

Options

A. 300 J
B. `-300 J`
C. `400 J`
D. `-400 J`

Answer

A

Explanation

Work done by all the forces = gain in KE `implies w = 1/2 (2) (-20)^(2) - 1/2 (2)(10)^(2) = 300 J`.