A particle is dropped from a height h. A constant horizontal velocity is given to the particle. Taking g to be constant every where, kinetic energy E of the particle w. r. t. time t is correctly shown in

As particle is projected with some velocity therefore its initial kinetic energy will not be zero. As it moves downward under gravity then its velocity increases with time K.E. ∝ v2 ∝ t2  (As v ∝ t)So the graph between kinetic energy and time will be parabolic in nature.