Question

an object of mass 1 kg is falling from height 10 metre calculate what will be the velocity of the object when it hits the ground​

Answer 1

Explanation:

Given, m = 1kg

h = 10m

u = 0 (dropped) (assuming as it is not given)

Let me assume that there is no air resistance

Method I:

Laws of motion for uniformly accelerated body,

v² - u² = 2as

v = √2gh

v = √2×10×10

v = 10√2 m/s

The velocity will be the same regardless of mass of the body when air resistance is negligible.

Method II: Conservation of energy

Potential energy at heigh 10m = Kinetic energy when it hits the ground

mgh = mv²/2

v = √2gh

v = 10√2 m/s