Question #292013

A projectile leaves the ground at an angle 30° to the horizontal. The kinetic energy is E neglecting the air resistance . Find in terms of E it's kinetic energy at the highest point of motion




1
Expert's answer
2022-02-01T09:50:47-0500

At highest point only vertical components of velocity

vx=vcosθ=vcos30°=32v_x=vcos\theta=vcos30°=\frac{\sqrt3}{2}

Eup=12mvx2Eup=12mv2cos2θE_{up}=\frac{1}{2}mv_x^2\\E_{up}=\frac{1}{2}mv^2cos^2\theta

Eup=12mv2×(32)2=38mv2E_{up}=\frac{1}{2}mv^2\times(\frac{\sqrt{3}}{2})^2=\frac{3}{8}mv^2

E=12mv2E=\frac{1}{2}mv^2

EupE=38mv2mv22\frac{E_{up}}{E}=\frac{\frac{3}{8}mv^2}{\frac{mv^2}{2}}

Eup=34EE_{up}=\frac{3}{4}E


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