Question: A projectile is launched at a 60.0° angle above the horizontal on level ground. The change in its velocity between launch and just before landing

A projectile is launched at a 60.0° angle above the horizontal on level ground. The change in its velocity between launch and just before landing is found to be

What is the initial velocity of the projectile? What is its final velocity just before landing?

AvVanding-Vaunch 20.0y m/s.

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