Asked Jan 28, 2019

A ball is released from rest at the top of a 30.0 m tall building. How long does it take to strike the ground? How fast is it moving when it strikes the ground?


Expert Answer

Step 1

Let y be the height of the building, u be the initial velocity, t be the time taken by the ball to strike the ground and g is the acceleration due to gravity. The equation of motion is given by,

Step 2

As the ball is just released, its initial velocity is zero. Therefore, the above equation can be re-written as,

Step 3

On Substituting t...


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