Need help for question 2abcd

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.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

True or false graphs must include scales that increase by the same amount