A missile is fired for maximum range with an initial velocity of 20 m/s. If g = 10 m/s², the range of the missile is

A particle moves in a circle of radius 5 cm with constant speed and time period 0.2$$\pi $$ s. The acceleration of the particle is

A particle moves in x-y plane according to rule x = asin$$\omega $$t and y = acos$$\omega $$t. The particle follows

The speed of a projectile at its maximum height is half of its initial speed. The angle of projection is