Q. A particle is projected from ground with speed $80\, m / s$ at an angle $30^{\circ}$ with horizontal from ground. The magnitude of average velocity of particle in time interval $t=2\, s$ to $t=6\, s$ is [Take $\left.g=10\, m / s ^{2}\right]$
Motion in a Plane
Solution:
Average velocity of the projectile when it is at the same vertical height is : $u \cos \theta$.
$\Rightarrow 80 \times \cos 30^{\circ}$
$\Rightarrow 40\, ms ^{-1}$
