You are creating a fireworks show for OU. The fireworks are launched from the gr

Question

You are creating a fireworks show for OU. The fireworks are launched from the ground at an angle 20.0 degrees from vertical. The fireworks are designed to explode at the top of their trajectories (where their speed is the smallest), and the show will be best if the height of the rockets when they explode is 110.0 meters. What should you design the initial speed of the rockets to be? Your answer should be in m/s, and you should ignore air resistance. Hint: You might want to draw a picture of this problem to make sure you have the heights and angles correct.

Explanation / Answer

the rocket has minimum velocity at top of projectile when vertical component of velocity=0 so, 0=ucos20^2-2g*110 u=49.4 m/s

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