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question 23

A projectile is fired at an angleθ with the horizontal. Find the condition under which it lands perpendicular on an inclined plane inclination alpha as shown in figure.

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Solution for marked question:

Applying equation of motion perpendicular to the incline for y=0



At the moment of striking the plane, as velocity is perpendicular· to the inclined plane hence component of velocity along incline must be zero




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