- #1

jarny

- 15

- 0

## Homework Statement

In shot putting, many athletes elect to launch the shot at an angle that is smaller than the theoretical one (about 42°) at which the distance of a projected ball at the same speed and height is greatest. One reason has to do with the speed the athlete can give the shot during the acceleration phase of the throw. Assume that a 7.42 kg shot is accelerated along a straight path of length 1.65 m by a constant applied force of magnitude 410 N, starting with an initial speed of 2.5 m/s (due to the athlete's preliminary motion). What is the shot's speed at the end of the acceleration phase if the angle between the path and the horizontal is (a) 27° and (b) 42°? (Hint: Treat the motion as though it were along a ramp at the given angle.) (c) By what percent is the launch speed decreased if the athlete increases the angle from 27° to 42°?

## Homework Equations

Fnet=m*a->

## The Attempt at a Solution

Ok, as of now I think I have the hang of it, I just have a question and the rest makes sense. What I am going to find the acceleration vector and use that with v_0 to find v in v=v_0+at. I am going to find the acceleration vector via pythagorean theorem from the Net forces of the x and y components of the ball. The y is simple (i think) and I will find it by the sum of the F_g (negative) and the y component of the 410N vector at the degrees specified. I am stumped with the x though, Am I just summing the x component of fapp vector with the force of the ball (directed along the ground)? Thanks