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Work Energy Theorem Application

A particle is...

Question

A particle is projected at time t = 0 from a point 'O' with a speed 'u' at an angle ' $θ$ ' to horizontal. Find the torque of a gravitational force on projectile about the origin at time 't'. (x, y plane is vertical plane)

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Solution

$\begin{matrix} d = u cos θ . t T = m g d = m g a cos θ . t T = m g u cos θ t \end{matrix}$ .

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