Physics

A projectile is fired straight upward at
143 m/s.
How fast is it moving at the instant it
reaches the top of its trajectory?
Answer in units of m/s.

How fast is it moving at the instant it reaches
the top of its trajectory if the projectile is
fired upward at 12◦
from the ho

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  1. It only has vertical speed.
    That speed is zero at the top.
    =======================
    Now the real one
    at top vertical velocity is zero
    HOWEVER the is NO horizontal force, so horizontal component is constant for the whole trip
    u = 143 cos 12 = 140 m/s

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    Damon

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