A projectile of mass M is fired horizontally with aninitial speed of Vo from a h

Question

A projectile of mass M is fired horizontally with aninitial speed of Vo from a height of H above a flat, desertsurface. Neglecting air friction, at the instant before theprojectile hits the ground, find the following in terms of M, Vo,H, and g: a) the work fone by the force of gravity on theprojectile b) the change in kinetic energy of the projectile since it wasfired c) the final kinetic energy of the projectile d) are any of the answers changed if the initial angle ischanged? A projectile of mass M is fired horizontally with aninitial speed of Vo from a height of H above a flat, desertsurface. Neglecting air friction, at the instant before theprojectile hits the ground, find the following in terms of M, Vo,H, and g: a) the work fone by the force of gravity on theprojectile b) the change in kinetic energy of the projectile since it wasfired c) the final kinetic energy of the projectile d) are any of the answers changed if the initial angle ischanged?

Explanation / Answer

Hi, I don't understand Part B, I thought it would just be finalKE-intial KE to get the change in KE ??

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