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# Projectile motion - the concepts

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A projectile of mass m is fired from the surface of the earth at an angle A from the vertical. The initial speed Vo is equal to the square root (GMe/Re). How high does the projectile rise? Neglect air resistance and the earth's rotation. (Hint: It is probably easier to apply the conservation laws directly instead of using orbit equations.)

If A=60 degrees then Rmax=3Re/2

##### Solution Summary

Explanation of a projectile motion problem with the fundamental physics.

##### Solution Preview

At the highest point, its kinetic energy must be equal to the potential energy.

ie, (1/2)mv^2 = mgh (considering 90 degree ...

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