calculate velocity of a body 3 m above the ground when dropped from 5 m height

A body of mass 2 kg is dropped from rest position 5 m above the ground. what is its velocity at height of 3 m above the ground.
another similar numerical is
A 70kg man runs up a long flight of stairs in 4 s. The vertical height of the stairs is 4.5m. Calculate his power. link is
• How to calculate the p...
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[@notnormalguy106]

Sir how to find the gravitational acceleration of Venus?

[@easyedu1]

f= G m1m2/r^2 => a=g= G M/r^2 m is mss of venus and r is radius of venus G is constant