Answer:5m
Explanation:a=-10m/s (since it moved upwards against gravity)
V=0
U=10m/s
v2=u2+2as
0= 100-20s
20s=100
s=5m
Acceleration is any change in speed or direction of motion.
Speeding up, slowing down, or moving along a curve are all accelerations.
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Answer:
![\omega'=19.419\ rev.s^{-1}](https://tex.z-dn.net/?f=%5Comega%27%3D19.419%5C%20rev.s%5E%7B-1%7D)
Explanation:
Given:
angular speed of rotation of friction-less platform, ![\omega=5.1\ rev.s^{-1}](https://tex.z-dn.net/?f=%5Comega%3D5.1%5C%20rev.s%5E%7B-1%7D)
moment of inertia with extended weight, ![I=9.9\ kg.m^2](https://tex.z-dn.net/?f=I%3D9.9%5C%20kg.m%5E2)
moment of inertia with contracted weight, ![I'=2.6\ kg.m^2](https://tex.z-dn.net/?f=I%27%3D2.6%5C%20kg.m%5E2)
<u>Now we use the law of conservation of angular momentum:</u>
![I.\omega=I'.\omega'](https://tex.z-dn.net/?f=I.%5Comega%3DI%27.%5Comega%27)
![9.9\times 5.1=2.6\times \omega'](https://tex.z-dn.net/?f=9.9%5Ctimes%205.1%3D2.6%5Ctimes%20%5Comega%27)
![\omega'=19.419\ rev.s^{-1}](https://tex.z-dn.net/?f=%5Comega%27%3D19.419%5C%20rev.s%5E%7B-1%7D)
The angular speed becomes faster as the mass is contracted radially near to the axis of rotation.