Irina standing on the edge of a cliff throws a stone at 40 degree angle above the horizontal with an initial speed of 10.0 m/s. the instant before the stone hits the ground below, it is traveling at a speed of 37 m/s. if irina were to throw the other rock at 40 degree angle below the horizontal from the cliff instead, with the same initial speed of 10.0 m/s, what is the magnitude of the velocity of the stone just before it hits the ground? ignore any effects of air resistance.

Explanation:

Given

First stone is thrown at an angle of Above horizontal

second stone is thrown at angle of below horizontal

let h be the height of building

Initial velocity is same in both case i.e. u=10 m/s

Horizontal velocity will remain same as there is no acceleration and there will only be vertical velocity change

for first case

Net velocity at ground

For second case

Let be the final vertical velocity

Final velocity at ground

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explanation:

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s