what is the speed of a 2.5 kg Mass after it has fallen freely from rest through a distance of 12 m

Answer 1

Use the kinematic relation

v² - v₀² = 2gy

v₀ = 0 (fell from rest)

g = acceleration of gravity = 9.8 m/s²

y = vertical fall distance = 12 m

v = final speed = ?

Plug in the numbers and solve for v. Note the mass of the object does not matter.