A projectile is fired straight upward at

Question

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

Answer 1

It only has vertical speed.
That speed is zero at the top.
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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