8. A Physics student on Planet Exidor throws a ball, and it follows the parabolic trajectory shown in Figure 6.8 (whille it will not be recreated on this forum, the figure shows a part of a parabolic curve which starts at the origin and peaks at t=2. It also shows the velocity vector at t=1, which will be entered later in the pst). The ball's position is shown at 1 s intervals until t=3s. At t=1 s, the ball's velocity is (2.0(adsbygoogle = window.adsbygoogle || []).push({}); i+ 2.0j)m/s, whereiandjare unit vectors.

a. determine the ball's velocity at t=0,2,and 3 s.

b. what is the value of g on planet Exidor?

c. what was the ball's launch angle.

I know how to do parts b and c, but can't do either without a. I'm not sure what formula to use, but I do know the following:

at t=1:

v1=(2.0i+ 2.0j)m/s

v1x=2.0im/s

v1y=2.0jm/s

ax=0

ay=-g m/s^2

v1x=v0x=v2x=v3x2.0im/s

x0=0m

y0=0m

Thank you in advance.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Projectile Motion trajectory Problem

**Physics Forums | Science Articles, Homework Help, Discussion**