(a) State two objects each used in sports and warfare which may be considered as projectiles.
(b) the horizontal range R, of a projectile is given by the expression;
R = (frac{u^2 sin 2theta}{g}) where (theta) is the angle of projection, g the acceleration of free fall due to gravity and u the initial velocity. At what value of (theta) will R be maximium?
Explanation
(a) Projectiles are used in;
(i)Sports as – Shortput, football, javelin etc
(ii) Warfare a bullet, spear,arrow etc.
(b) A R maximum (theta) = 45°