An object is dropped near the earth's surface. At the end of 4.0 s, how fast is it falling in m/s? (Ignore air resistance.)

For free falling bodies, the final velocity may be calculated through the equation,

Vf = gt

Where g is the acceleration due to gravity (9.8 m/s²) and t is the time elapsed. Substituting the known values,

Vf = (9.8 m/s²) x (4 s) = 39.2 m/s

Therefore, the object's velocity is approximately 39.2 m/s.