Plz

its given me a hard time

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 feature of a heating curve indicates a change ofn state

What sort of waves exhibit the doppler effect?