A projectile of mass m is fired horizontally with an initialspeed of v0 from a height of h above a flat, desert surface.Neglecting air friction, at the instant before the projectile hitsthe ground, find the following in terms of m, v0, h, and g : (a) thework done by the force of gravity on the projectile, (b) thechange in kinetic energy of the projectile since it was fired,and (c) the final kinetic energy of the projectile. (d) Are anyof the answers changed if the initial angle is changed?

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Asked Dec 17, 2019
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A projectile of mass m is fired horizontally with an initial
speed of v0 from a height of h above a flat, desert surface.
Neglecting air friction, at the instant before the projectile hits
the ground, find the following in terms of m, v0, h, and g : (a) the
work done by the force of gravity on the projectile, (b) the
change in kinetic energy of the projectile since it was fired,
and (c) the final kinetic energy of the projectile. (d) Are any
of the answers changed if the initial angle is changed?

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Expert Answer

Step 1

(a)

The work performed by the gravitational force is equal to the change in gravitational potential energy.

(b)

Since there is no friction, the kinetic en...

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W =mgh KE = mgh

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