- #1

kpadgett

- 8

- 0

## Homework Statement

Jill throws a Javelin by first accelerating it from rest through 85 cm and releasing it from a height

of 2.2 m at an angle of 35 degrees and it goes a distance of 62 m.

A) What are the values of the vertical and horizontal components of initial velocity?

B) Find the following:

X-initial position, Y-initial position

X-final pos., Y-final pos.

X-velocity initial, X-velocity final

Y-velocity initial, X-velocity final

Acceleration in x and y direction

and t-final for X and Y

C) What is the magnitude of the impact velocity vector?

D) What is the impact angle?

## Homework Equations

I'm sure I have missed one:

V=(ds/dt)

a= (Vf-Vi)/(tf-ti)

x(t)=xi + (Vx)(t)

y(t)=yi + (Vy)(t) - (1/2)gt^2)

## The Attempt at a Solution

I started writing down all my known terms and have the following from the given info:

Xi = 0

Yi = 2.2m

ax = 0

ay = -g = 9.8m/s^2

Yf = 0

Xf + 62

Theta = 35 degrees

At this point I went to plug known values into the x(t) and y(t) equations to find unknowns. The needed unknowns I see now are velocity and time of impact.

I am completely stumped on the next step to take from here to find velocity or time of impact. Any help would be appreciated.