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11.10.2020 •
Physics
A blue shark accelerates at a rate of 16m/s for a time of 0.8s. During this time it travels a distance of 11.52m. Calculate its initial speed.
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Ответ:
The initial velocity of this shark is
. (Assuming that the unit of the acceleration in this question is
.)
Explanation:
Let
denote the acceleration of this shark.
Let
denote the initial velocity of this shark.
Assume that the acceleration
of this shark is constant (as it is in this question.) Over a period of time
, the shark would have travelled a distance of:
This question states that:
This question is asking for
, the initial velocity of this shark at the beginning of this
-second period. Substitute the three known values into the equation:
Solve for
:
Ответ:
The potential energy is zero since the rock isn't moving.