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14.09.2019 •
Physics
At time t=0, rock a is dropped from rest from a height of 90 m. at the same instant, rock b is launched straight up from the ground level with an initial speed of 30 m/s. write an equation of motion for rock a and b, giving its position at all time.
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Ответ:
rock A:![y=90-1/2*g*t^2](/tpl/images/0231/3570/2617a.png)
rock B:![y=30*t-1/2*g*t^2](/tpl/images/0231/3570/ff855.png)
g=9.81m/s^2
Explanation:
Kinematics equation:
in our case the acceleration is the gravity and it has a negative direction.
a=-g
rock A, yo=90m, Voy=0m/s:
rock B, yo=0m, Voy=30m/s:
Ответ:
King’s claim is that segregation must end.
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King provides opponents’ counterclaims.
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King provides a conclusion.