physics
posted by Rich .
A projectile is launched at a speed of 141m/s and an angle of 45 degrees. How fast is it moving at the top of its curved trajectory?

Since the object is at the top of its trajectory its change in altitude (sin velocity) should be 0.
Then you just need to calculate for the speed in the horizontal axis(which never changes in simple projectile motion).
It becomes 141 cos(pi/4)
or 141 cos (45) if you prefer degrees.
This is of course assuming that its a simple projectile motion.
Respond to this Question
Similar Questions

Physics
A projectile is launched with an initial speed of 40m/s at an angle of 25 degrees above the horizontal. The projectile lands 3 sec. later. Neglect air friction. What is the projectile's velocity at the highest point of it's trajectory? 
physics
A projectile is launched at 45 degrees above the horizontal plane, How fast is it moving at the top of its curved trajectory? 
Physics
A projectile is fired up into the air at a speed of 164 m/s at an angle of 37° relative to the horizontal. Ignore air drag. A.) Determine the MAXIMUM HEIGHT (above where it was thrown) the projectile will reach. m B.) Determine how … 
physics
A projectile is launched with an initial speed of 70 m/s at an angle of 35° above the horizontal on flat ground. Neglect air friction. A)What is the projectile's velocity at the highest point of its trajectory? 
Physics
A projectile is launched at an angle of 64.3 degrees with the horizontal (x axis) at some unknown velocity. After 4 seconds, the object's angle of trajectory is 47.2 degrees above the horizontal. What is the object's vertical displacement … 
Physics
A projectile is ﬁred straight upward at 167 m/s. How fast is it moving at the instant it reaches the top of its trajectory? 
physics
A projectile launched straight upward at 141 m/s. How fast is it moving at the top of its trajectory? 
Physics
A projectile is launched with an initial speed of 80.0m/s at an angle of 40 degrees above the horizontal. The projectile lands on a hillside 3.80s later. Neglect air friction. What is the projectile's velocity at the highest point … 
Physics
A projectile is launched with an initial speed of 59.0 m/s at an angle of 32.0° above the horizontal. The projectile lands on a hillside 3.80 s later. Neglect air friction. (Assume that the +xaxis is to the right and the +yaxis … 
Physics
The highest wall that a projectile can clear is 17m, when the projectile is launched at an angle of 35.0 degrees above the horizontal. What is the projectile's launch speed?