Question

Asked Jan 28, 2019

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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?

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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