You throw snowballs down to the sidewalk from the roof of a building. Which tech

Question

You throw snowballs down to the sidewalk from the roof of a building.

Which technique, if either, makes the snowballs land with more speed: throwing them straight down as hard as you can or throwing them straight up with the same speed? (Ignore air resistance.)

A) Both techniques cause the snowballs to hit the sidewalk at the same speed. B) Throwing the snowballs straight down makes them to land with greater speed than throwing them straight up. C) Throwing the snowballs straight up makes them to land with greater speed than throwing them straight down.

Explanation / Answer

From the conservation of mechanical energy, the potential energy due to the height is converted to the kinetic energy at the bottom.

So, in both cases, the speed at the bottom will be the same.

So, option (A) is correct. i.e,

Both techniques cause the snowballs to hit the sidewalk at the same speed.

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