Hhhep faaast pls​

An object is dropped from a tower, 400 ft above the ground. the object's height above ground t seconds after the fall is s(t)equals400 minus 16 t squared. determine the velocity and acceleration of the object the moment it reaches the ground. the velocity of the object the moment it reaches the ground is nothing ft/s.

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

The least penetrating form of radiation is