A shell is fired with a horizontal velocity in the positive x direction from the top of an 80-m high cliff. The shell strikes the ground 1330 m from the base of the cliff. The drawing is not to scale. What is the magnitude of the velocity of the shell as it hits the ground?

Explanation:

First let's find the time that takes the shell to hit the ground (height zero).

To find this time, we can use the equation:

Where S is the final position, So is the inicial position, Vo is the inicial speed, a is the acceleration and t is the time. Then, for the vertical movement of the shell, we have that:

Now, to find the horizontal speed, we use the equation:

Then, for the horizontal movement, we have:

Now we need to find the vertical speed, using:

Finally, to find the magnitude of the velocity, we have:

it would be c. predictability