Question

As you are driving to school one day, you pass a construction site for a new building and stop to watch for a few minutes. A crane is lifting a batch of bricks on a pallet to an upper floor of the building. Suddenly a brick falls off the rising pallet. You clock the time it takes for the brick to hit the ground at 2.5 seconds. The crane, fortunately, has height markings and you see the brick fell off the pallet at a height of 22 meters above the ground. A falling brick can be dangerous, and you wonder how fast the brick was going when it hit the ground. Since you are taking physics, you quickly calculate the answer.

Answer 1

The value is
`v = 24.5 \ m/s`

Step-by-step explanation:

Generally from kinematic equation we have that

`v = u + at`

Here u is equal to zero given that the batch was at rest

a is equal to the g which has a value
`g = 9.8\ m/s^2`

and t is 2.5 \ s

So

`v  =  0 + 9.8 *  2.5`

`v = 24.5 \ m/s`