1.A rock is dropped from a garage roof from rest. The roof is 6.0 m from the ground. a) Determine the how long it takes the rock to hit the ground b) Determine the velocity of the rock as it hits the ground.
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Answer:
Given the data in the question;
Since the rock was initially at rest
Initial velocity;
Height or distance of roof from the ground;
Time taken for the rock to hit the ground;
To determine the time taken for the rock to hit the ground, we use the second equation of motion:
Where s is the height or distance, u is the initial velocity, t is time taken and a is acceleration due to gravity( since the rock will be under gravity, )
We substitute our values into the equation
Therefore, time taken for the rock to hit the ground from the roof top is 1.1 seconds.