Question

A stone is thrown horizontally with a velocity ν from the top of the tower of height h. what is the change in velocity when the some reaches the ground.

(a) [u2 + 2gh]1/2.

(b) [u2 - 2gh]1/2.

(c) √2gh

(d) [u2 + 2gh]1/2 – u

Answer 1

Answer is (c) √2gh

Initial velocity = iu

Final velocity = iu + j √2gh,

Hence ∆ν = √2gh.