A stone is thrown vertically upward with the velocity of 25 m/s. How long day it take to reach the maximum height? Also calculate the height

The stone takes 2.55 sec to reach a maximum height of 31.89 m

Explanation:

Vertical Motion

When an object is thrown vertically up with a speed vo, it loses speed because of the effect of the gravity and gains height until the speed is eventually zero. The height attained at that time is called maximum height, and can be calculated as follows:

Since vo=25 m/s

Also, the time taken to reach the maximum height is calculated by:

The stone takes 2.55 sec to reach a maximum height of 31.89 m

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

snell's law

refractve index = sin incidence / sin refraction