A block of mass 2 kg is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F = 40 N. The kinetic energy of the particle increases 40 J in a given interval of time. Then, `(g = 10 m//s^(2))`
A. Tension in the string is 40 N
B. Displacement of the block in the given interval of time is 2m
C. Power developed by this force varies linearly with displacement
D. Power developed by this force varies parabolically with displacement
