- #1

cks

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In the

first case, a ball with a mass m is thrown vertically upward,

second case, a ball with the same mass is thrown horizontally,

third case, a ball with the same mass is thrown vertically downward,

Compare the velocity v when the ball hit the ground for the first, second and third case.

If I use conservation of energy to work it, I find that the velocity at the bottom of the ground is the same for each case.

However, if I use equation of linear motion, I find that the second case, the ball hits the ground with a velocity smaller than the first and third case.

What is wrong??? I'm totally confused.

first case, a ball with a mass m is thrown vertically upward,

second case, a ball with the same mass is thrown horizontally,

third case, a ball with the same mass is thrown vertically downward,

Compare the velocity v when the ball hit the ground for the first, second and third case.

If I use conservation of energy to work it, I find that the velocity at the bottom of the ground is the same for each case.

However, if I use equation of linear motion, I find that the second case, the ball hits the ground with a velocity smaller than the first and third case.

What is wrong??? I'm totally confused.