Question
A projectile is projected at $10 \, \text{m/s}$ by making an angle $60^\circ$ to the horizontal. After some time, its velocity makes an angle of $30^\circ$ to the horizontal. Its speed at this instant is
A projectile is projected at $10 \, \text{m/s}$ by making an angle $60^\circ$ to the horizontal. After some time, its velocity makes an angle of $30^\circ$ to the horizontal. Its speed at this instant is