A ball is thrown from the top of a cliff at an angle theta withrespect to the ho

Question

A ball is thrown from the top of a cliff at an angle theta withrespect to the horizontal direction with an initial speed of 10m/s. The kinetic energy of the ball when it strikes the ground willbe greatest when theta =
1. 0 degrees;because 0 degrees means a horizontal launch so no speed is wastedin the vertical direction.
2. 45 degrees; because 45 degrees gives the longest range forprojectile motion and hence the greatest kinetic energy.
3. 90 degrees; because 90 degrees is a vertical launch so novelocity is wasted on horizontal motion.
4. all give the same kinetic energy; the overall verticaldisplacement is the same in all three cases so the change ingravitational energy is the same in all three cases.
1. 0 degrees;because 0 degrees means a horizontal launch so no speed is wastedin the vertical direction.
2. 45 degrees; because 45 degrees gives the longest range forprojectile motion and hence the greatest kinetic energy.
3. 90 degrees; because 90 degrees is a vertical launch so novelocity is wasted on horizontal motion.
4. all give the same kinetic energy; the overall verticaldisplacement is the same in all three cases so the change ingravitational energy is the same in all three cases.

Explanation / Answer

4. all give the same kinetic energy; the overall verticaldisplacement is the same in all three cases so the change ingravitational energy is the same in all three cases.

Initial kinetic energy is the same in all cases. Change in gravpotential energy is also the same.

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