Question

A certain projectile is launched with an initial speed of Vo. At its highest point, its speed is 1/2Vo. What was the launch angle of the projectile?
A. 30 degree
B. 45 degree
C. 60 degree
D. 75 degree

Anyone pls show me how to calculate this!!

Answer 1

c. 60'
since horizontal velocity is constant in a projectile
and at the highest point projectile has no vertical velocity.
so V0 cos (theta)= V0/2
so theta=60'

Answer 2

thank you!