A beam of uniform dimensions 100 m long, suspended by a rope in the center of the center, with weights A, B and C, suspended from one end of the beam at a distance of 5, 40 and 90 m, respectively, if A and B weighs 200 and 100 n. How heavy must the beam C be to be in equilibrium?

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explanation:

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge