I’m in physics and I don’t really understand how to do this

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

area of focus

beta is electron from nucleus

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

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it