Question

If a mass of 4 kg is dropped from a height of 100 m, what will be its velocity when it reaches the ground

Answer 1

When a body is throw or dropped from some height then we take initial velocity i. e u=0 because when the body is dropping the body is at rest.

Now, we apply the formula v^2-u^2=2as

But a is replaced by g and s is replaced by h..

v^2-u^2=2gh

v^2=0+2*10*100

v^2=2000

v=√2000

v=44.6m/s..