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.

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# Projectile Motion Problem

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