Two bodies freely fall: one from a height of 20m, and the other from a height of 80m.

Two bodies freely fall: one from a height of 20m, and the other from a height of 80m. How fast do bodies land? Determine the fall time.

The path traversed by a freely falling body: S = g * t² / 2.

Instantaneous speed of a freely falling body: v = g * t.

For the first body:

4.9 * t² = 20, whence t = 2.02 s,

v (2.02) = 19.8 m / s.

For the second freely falling body:

4.9 * t² = 80, whence t = 4.04 s,

v (4.04) = 39.6 m / s.