Question

A ball is thrown down wards with velocity V from the top of a tower and it reaches the ground with speed 3V. what is the eight of the tower.

(a) V²/g.

(b) 2V²/g.

(c) 4V²/g. 

(d) 8V²/g.

Answer 1

Answer is (c) 4v²/g

Use v² - u² = 2ax, here v = 3v, u = v and a = g. hence x = 4v²/g