- #1

John H

- 36

- 0

## Homework Statement

The masses of the javelin, discus, and shot are 0.8kg, 2kg, 7.2kg, respectively, and record throws in the track events using these objects are about 89 m, 69 m, 21 m. respectively. Neglecting air resistance, (a) calculate the minimum kinetic energies that would produce such throws, and (b) estimate the average force exerted on each object during the throw, assuming that force acts over a distance of 2m.

## Homework Equations

W= [tex]\Delta[/tex]Ek

W= [tex]\Delta[/tex]Eg

w = F [tex]\times[/tex] [tex]\Delta[/tex]d

Eg= mg[tex]\Delta[/tex]h

Ek = 1/2mv^2

## The Attempt at a Solution

I attempted to use the law of conservation of mechanical energy, ignoring any effects a non conservative force such as air resistance would have on the system, but am unable to find initial velocity due to the fact that i do not have the height of the projectiles at their maximum point, and i see no way to mathematically remove them from my calculations