Question

A point mass is projected making an acute angle with the horizontal. If angle between velocity $\overrightarrow{v}$ and acceleration $\overrightarrow{g}$ is $0$, then $\theta$ is given by

• A. $0^o<\theta <{90}^o$
• B. $\theta ={90}^o$
• C. $\theta ={180}^o$
• D. $0^o<\theta <{180}^o$

Answer 1

The correct option is A $0^o<\theta <{90}^o$

If then angle of projection is $0°<\theta <90°$ then just before hitting the ground the angle between velcoity $\overrightarrow{V}$ and acceleration $\overrightarrow{g}$ is 0.Since $\overrightarrow{V}$ points exactly downwards