Arock is dropped at the same instant that a ball at the same initial elevation is thrown horizontally. which will have the greater speed when it reaches ground level?

 If we consider vertical velocity both have same vertical velocity of

  Resultant velocity when stone hits the ground is more for thrown horizontally.

Explanation:

We have equation of motion, , where u is the initial velocity, u is the final velocity, s is the displacement and a is the acceleration.

When rock is dropped:

    Initial velocity = 0 m/s , displacement = H and acceleration = g.

 When rock is thrown horizontally:

    Considering vertical motion of rock

       Vertical initial velocity = 0 m/s ,Vertical displacement = H and vertical acceleration = g.

 If we consider vertical velocity both have same vertical velocity of

 But stone thrown horizontally will have horizontal velocity also, so it has more velocity if we compare resultant velocity.

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explanation:

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."