i)A rocket is launched at an angle of 70.9 degrees from the horizontal from an altitude of 5.4m with a speed of 6.3m/s. Use energy methods to find its speed when its altitude is 2.7 m.(adsbygoogle = window.adsbygoogle || []).push({});

I got a correct answer of 9.6234 m/s. I need help for the next part.

ii)Find the y component of the velocity when the rocket's altitude is 2.7m.

i dont quite what velocity i should use? i tried using the velocity i got for the first part but the answer is incorrect.

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# Projectile motion using energy method

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