According to my physics textbook: Workdone=force x distance moved by object in the direction of the force. This is ridiculous in a scenario with no friction force. For example, an object of mass 5kg, in space with no friction force or gravitional force is accelerated from rest to a velocity of 10ms-1 by a force of 10N over 5seconds. From newton first law, the object will continue to move at a velocity of 10ms-1 even after the force applied is removed and will continue forever unless another force is applied to stop it. As such, the distance moved by the object in such a scenario will be infinite. Infinite x 10N = infinity. Does this means a force 10N applied for 5s can transfer infinite amount of energy?