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*i*+ 2.0

*j*)m/s, where

*i*and

*j*are 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=(2.0

*i*+ 2.0

*j*)m/s

v1x=2.0

*i*m/s

v1y=2.0

*j*m/s

ax=0

ay=-g m/s^2

v1x=v0x=v2x=v3x2.0

*i*m/s

x0=0m

y0=0m

Thank you in advance.