An object of mass mis initially at rest and free to move without friction in any direction in the xy-plane. A constant net force of magnitude Fdirected in the +x direction acts on the object for 1 s. Immediately thereafter a constant net force of the same magnitude F directed in the +y direction acts on the object for 1 s. After this, no
forces act on the object.
Which of the following graphs best represents the kinetic energy K of the object as a function of time?