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Where am I wrong in proving that force perpendicular to motion increases speed and kinetic energy? [closed]
Lets think of a helicopter flying at some height $h$. It throws a food packet to a person on the ground from air. Let's neglect the air drag.
The food packet is thrown only with some velocity $v_x$ in ...
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Work and Gravitational Potential Energy
If we lift and object up, the net work is clearly zero because the kinetic energy after the lift and before the lift are the same (0). However, the object still seems to gain gravitational potential ...
