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## Homework Statement

An athlete putts a shot of mass 7 kg a distance of 20 m. Show that the athlete must do to

at least 700 joules of work to achieve this. (ignore the height of the athlete.)

**2. Homework Equations [**

E=T+V

Work=T2-T1

when the ball reaches maximum height, its velocity is zero. I should problem find the angle that gives the ball its maximum range. I am not sure how to find the angle that gives the ball its maximum range. maximum range is 20 meters.

.5*m*v^2=mgz ==> v=sqrt(2gz)= 20 m/s

R cos(theta)=v*u/g

E=T+V

Work=T2-T1

## The Attempt at a Solution

when the ball reaches maximum height, its velocity is zero. I should problem find the angle that gives the ball its maximum range. I am not sure how to find the angle that gives the ball its maximum range. maximum range is 20 meters.

.5*m*v^2=mgz ==> v=sqrt(2gz)= 20 m/s

R cos(theta)=v*u/g