A particle is launched into the air from the ground with launch speed 8 m/s. The speed of the particle at maximum height is 4 m/s. Find a) the launch angle.  b) maximum height reached by the particle.  c) range of the particle.

Principles of Physics: A Calculus-Based Text
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Chapter3: Motion In Two Dimensions
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(i) A particle is launched into the air from the ground with launch speed 8 m/s. The speed of the particle at maximum
height is 4 m/s. Find


a) the launch angle. 
b) maximum height reached by the particle. 
c) range of the particle. 


(ii) In projectile motion, what assumption makes the horizontal speed constant?

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