A projectile is fired with kinetic energy 1kJ. If the range is maximum, what is its kinetic energy, at the highest point ?

Explanation

Here `(1)/(2)mv^(2)=1kJ=1000J,theta=45^(@)`
At the highest point K.E. `=(1)/(2)m(vcostheta)^(2)=(1)/(2)(mv^(2))/(2)=(100)/(2)=500J`