I was wondering if I was right about this simple problem:
A projectile is shot at an angle of 37.0° with the horizontal. The velocity of the projectile at its peak height is 16 m/s.
Then I was told to find the velocity in x direction.
So I wrote: Given that at its peak, the velocity of the projectile in y direction is equal to 0, but stated that at its peak, the velocity of the projectile is 16 m/s, this must be the velocity in x direction. So my final answer was: 16 m/s.
But then, my teacher just said it was wrong. That I had to find Vx using the formula Vx= Vcos(37°). I told her that 16 m/s could not be the initial velocity, since the problem says that 16 m/s is the velocity at its peak, therefore it must be Vx.
Am I right? If so, can you tell me a good explanation besides the one I said to prove my teacher wrong. If not, what am I missing?