Subatomic particles with a positive charge are known as

The proton is a subatomic particle with a positive elemental electric charge equal in absolute value and opposite sign to that of the electron. This is due to the action of the electromagnetic force.

This particle was made known by Ernest Rutherford in the twentieth century (specifically in the year 1918).

It should be noted that protons are classified within the category of baryons which are subatomic particles formed by three quarks.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

it's a b and