A 2.00-kg projectile is fired upward at an $∠ 20^{\circ}$ with the horizontal. What is the magnitude of the force exerted on the projectile when it is at the highest position in its trajectory? Neglect any effects of air resistance.

upward, 15.8 N

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downward, 15.8 N

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upward, 19.6 N

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downward, 19.6 N

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Solution

The correct option is D
downward, 19.6 N

F = mg (downward), throughout motion
F = (2.00kg)(9.81 N/kg) = 19.6N

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