A body is projected, making an acute angle \( \theta \) with the horizontal. If angle between velocity \( \vec{v} \) and acceleration \( \vec{g} \) is \( \theta \), then
Show Hint
In projectile motion, the angle between the velocity and acceleration is always less than 180°.
Step 1: Understand the motion of a projected body.
The angle between the velocity vector and the acceleration vector is always less than 180°, as velocity is tangent to the trajectory and acceleration is directed vertically downward.
Step 2: Conclusion.
Hence, the angle \( \theta \) between the velocity and the acceleration is always less than 180°.
Final Answer:
\[
\boxed{\theta < 180^\circ}
\]