Answer:
work done on the object will be 10 J
Step-by-step explanation:
As we know by work energy theorem that work done by all the forces is equal to change in kinetic energy
It is given as

here we know that

now its 10 J of potential energy is converted into kinetic energy
Which means the kinetic energy finally becomes

now by above equation we know that


so work done on the object will be 10 J