Time it takes stone to fall from the height of 80 m is approximately equal to * A. 1 s
B. 2 s
C. 4 s
D. 8 s

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied. true or false

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

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.