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Centripetal force of an object, work done, gravity, air resistance

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Solution:
5:
The force is perpendicular to the velocity. That means there is no movement along the direction of the force, so, the work done by the force is zero.

6:
Same as above.

7:
For the descent of a projectile, the movement direction of the projectile is ...

Solution Summary

The problems are carefully explained and solved.

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