Question

A Ball is launched horizontally from a height of 3.2 m and strikes the ground 4.1 meters away

(measured horizontally). What was the initial velocity of the ball? Would a stopwatch be a

reasonable device for measuring the time this takes? Why or why not?

Answer 1

u = 7.91 m/s

Step-by-step explanation:

It is given that,

Height from which a ball is launched is 3.2 m

It strikes the ground 4.1 meters away

We need to find the initial velocity of the ball. When the ball strikes the ground, its final velocity is equal to 0. Let u is the initial velocity. Using the conservation of energy as follows :

`u=√(2gh) \\\\u=√(2* 9.8* 3.2) \\\\u=7.91\ m/s`

Hence, the initial velocity of the ball is 7.91 m/s. Yes, a stopwatch be a reasonable device for measuring the time this takes.