If you push a crate with a force of 100 n and it slides at a constant speed and in the same direction, how much friction is acting on the crate

100 N

Explanation: Taking into account the second Newton Law the total force applied to any system is equal to the mass *acceleration.In this case the crate moves at constant speed so the accelaration is zero. In order to satisfy this fact, the friction force must be equal the applied force of 100 N .

battery with hi vtge high val resist in series

if they have a finite resultant