Question

A ball is thrown vertically upwards with velocity v from the top of a tower and it reaches the ground with speed 4v. Height of the tower is ny2 by 2g Find n in ratio form?​

Answer 1

Explanation:

Given,

Initial velocity, u=−μms−1

Final velocity, v=3μms−1

Apply first kinematic equation of motion

  v=u+at

 3μ=−μ+gt

 t=g4μ

Hence, time required to reach ground is g4μ