18-11-2022
Physics

Answered

Bill throws a 10.0-g ball straight down from a height of 2.0m. The ball strikes the floor at a
speed of 7.5 m/s. What was the initial speed of the ball?

Answer :

triptivt3 triptivt3

22-11-2022

The initial speed of the ball is 4.12 m/s.

What is speed?

Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.

Given parameters:

Mass of the ball; M = 10.0 g.

Height from where ball straight down from : h = 2.0 m.

Final speed of ball; v = 7.5 m/s.

And we known that, acceleration due to gravity; g = 9.8 m/s²

We have to find: the initial speed of the ball: u = ?

We know that, v² = u² + 2gh

⇒ u² = v² - 2gh

⇒ u² =( 7.5)² - 2×9.8 ×2

⇒ u² = 17.05

⇒ u = 4.12 m/s.

Hence, the initial speed of the ball is 4.12 m/s.

Learn more about speed here:

https://brainly.com/question/28224010

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