# A hockey puck slides off the edge of a table with an initial velocity of 20.0 m/s. The height of the table above the ground is 2.0 m. What is the magnitude of the velocity of the puck just before it touches the ground?

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A hockey puck slides off the edge of a table with an initial velocity of 20.0 m/s. The height of the table above the ground is 2.0 m. What is the magnitude of the velocity of the puck just before it touches the ground?

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Step 1

Given that the initial velocity of the puck is 20.0m/s, and the height of the table above the ground is 2.0m. Since the puck is sliding off the edge of a table, initially it has velocity only in the horizontal direction. The vertical component of its initial velocity is zero. Write the equation of motion of the puck along the vertical direction.

Step 2

Since the initial vertical velocity is zero, the vertical displacement is equal to the height of the table (h), and the vertical acceleration of the puck is equal to the acceleration due to gravity (g) equation (1) can be modified and solved for t as shown below.

Step 3

The horizontal component of the final velocity (as the puck touches...

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